Elasticsearch lookup plugin stub for assignment 2

.gitignore

@@ -0,0 +1,27 @@
+.idea/
+.gradle/
+build/
+out/
+*.swp
+*-execution-hints.log
+*-execution-times.log
+
+// ignore the downloaded model files in git
+src/test/resources/models/
+
+// intellij
+*.iml
+*.ipr
+*.iws
+
+// eclipse
+.project
+.classpath
+eclipse-build
+*/.project
+*/.classpath
+*/eclipse-build
+.settings
+!/.settings/org.eclipse.core.resources.prefs
+!/.settings/org.eclipse.jdt.core.prefs
+!/.settings/org.eclipse.jdt.ui.prefs

LICENSE.txt

@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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+      the terms of any separate license agreement you may have executed
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NOTICE.txt

@@ -0,0 +1,2 @@
+your_name
+Copyright 2022- your_name

README.md

@@ -0,0 +1,83 @@
+# Elasticsearch Lookup Ingest Processor (stub)
+
+Here is a partially complete repo that you should use to create a lookup ingest processor plugin for ElasticSearch. Given a field and a lookup-map, the processor, when ingesting a document, will apply the given lookup-map on the given field, thus replacing all occurrences of the map keys, with the map values. The idea is to, for example, replace product codes with product names, or replace id-emails with the corresponding name-email.
+
+For example, if my documents are about a car and I know that code C001 means tyre, when ingesting a document I want to replace all occurrences of C001 with tyre, so that a document with field = "Need to optimize the C001 temperature", would be indexed as "Need to optimize the tyre temperature".
+
+
+## Expected results
+
+
+Once installed, your plugin should work as follows.
+
+First you register a pipeline, using your processor plugin (processors => lookup)
+
+
+```
+PUT _ingest/pipeline/lookup-pipeline
+{
+  "description": "A lookup pipeline",
+  "processors": [
+    {
+      "lookup" : {
+      "field" : "field1",
+      "lookup-map" : {
+        "C001":"tyre" ,
+        "C010":"front wing",
+        "C100":"damper"
+      }
+    }
+  }]
+}
+```
+
+Then you ingest a document on an index using the pipeline you just registered
+
+```
+PUT /something/something/1?pipeline=lookup-pipeline
+{
+  "field1" : "Need to optimize the C001 temperature. C010 needs to be changed as it is damaged. C100 seems ok."
+}
+```
+
+When ingesting the document, ElasticSearch will apply your processor, thus replacing the lookup-map keys with values. When you get the document you just ingested, you should get the following:
+
+```
+GET /something/something/1
+{
+  ...
+  "_source" : {
+    "field1" : "Need to optimize the tyre temperature. front wing needs to be changed as it is damaged. damper seems ok."
+  }
+}
+```
+
+
+## How to
+
+To open the project with Idea, you should run
+
+```
+./gradlew idea
+open ingest-lookup.ipr
+```
+
+To install the plugin, you need to perform the following operation.
+
+```bash
+./gradlew build
+```
+
+This will build the plugin, also running all tests, checkstyle and findbugs. If tests are not green or if there are checkstyle / findbugs violation, the project will not build, so you need to fix your code in order to build the plugin.
+
+Once the gradle build successfully completes, you will find a zip file named `ingest-lookup-8.1.1.zip` in `build/distributions`. You can install the plugin in ElasticSearch with the following command:
+
+```
+<ES-LOCATION>/bin/elasticsearch-plugin install --batch file:/<PATH-TO-LOOKUP-PLUGIN>/build/distributions/ingest-lookup-8.1.1.zip
+```
+
+If you want to build your plugin, without running all the tests, you can use the following command:
+
+```bash
+./gradlew assemble
+```

build.gradle

@@ -0,0 +1,47 @@
+buildscript {
+  repositories {
+    mavenLocal()
+    mavenCentral()
+    jcenter()
+  }
+
+  dependencies {
+    classpath "org.elasticsearch.gradle:build-tools:${elasticsearchVersion}"
+  }
+}
+
+repositories {
+  mavenCentral()
+}
+
+group = 'usi.vaa.elasticsearch.plugin.ingest'
+version = "${elasticsearchVersion}"
+
+apply plugin: 'java'
+apply plugin: 'idea'
+apply plugin: 'elasticsearch.esplugin'
+
+esplugin {
+  name 'ingest-lookup'
+  description 'When ingesting a document, the plugin will apply a given lookup-map on a given field'
+  classname 'usi.vaa.elasticsearch.plugin.ingest.lookup.IngestLookupPlugin'
+  // license of the plugin, may be different than the above license
+  licenseFile rootProject.file('LICENSE.txt')
+  // copyright notices, may be different than the above notice
+  noticeFile rootProject.file('NOTICE.txt')
+}
+
+// In this section you declare the dependencies for your production and test code
+dependencies {
+  compileOnly "org.elasticsearch:elasticsearch:${elasticsearchVersion}"
+}
+
+
+// ignore javadoc linting errors for now
+tasks.withType(Javadoc) {
+  options.addStringOption('Xdoclint:none', '-quiet')
+}
+
+test {
+  jvmArgs '-Dtests.security.manager=false'
+}

gradle.properties

@@ -0,0 +1 @@
+elasticsearchVersion = 8.6.2

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.1-bin.zip
+networkTimeout=10000
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

@@ -0,0 +1,245 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,92 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle

@@ -0,0 +1 @@
+rootProject.name = 'ingest-lookup'

src/main/java/usi/vaa/elasticsearch/plugin/ingest/lookup/IngestLookupPlugin.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright [2020] [your_name]
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package usi.vaa.elasticsearch.plugin.ingest.lookup;
+
+import org.elasticsearch.common.collect.MapBuilder;
+import org.elasticsearch.ingest.Processor;
+import org.elasticsearch.plugins.IngestPlugin;
+import org.elasticsearch.plugins.Plugin;
+
+import java.util.Map;
+
+public class IngestLookupPlugin extends Plugin implements IngestPlugin {
+
+    @Override
+    public Map<String, Processor.Factory> getProcessors(Processor.Parameters parameters) {
+        return MapBuilder.<String, Processor.Factory>newMapBuilder()
+                .put(LookupProcessor.TYPE, new LookupProcessor.Factory())
+                .immutableMap();
+    }
+
+}

src/main/java/usi/vaa/elasticsearch/plugin/ingest/lookup/LookupProcessor.java

@@ -0,0 +1,72 @@
+/*
+ * Copyright [2020] [your_name]
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package usi.vaa.elasticsearch.plugin.ingest.lookup;
+
+import org.elasticsearch.common.Strings;
+import org.elasticsearch.ingest.AbstractProcessor;
+import org.elasticsearch.ingest.IngestDocument;
+import org.elasticsearch.ingest.Processor;
+
+import java.io.IOException;
+import java.util.Map;
+
+import static org.elasticsearch.ingest.ConfigurationUtils.readMap;
+import static org.elasticsearch.ingest.ConfigurationUtils.readStringProperty;
+
+public class LookupProcessor extends AbstractProcessor {
+
+    public static final String TYPE = "lookup";
+
+    private final String field;
+
+
+    // TODO this signature and method might be incomplete - change as needed
+    public LookupProcessor(String tag, String description, String field,
+                           Map<String,String> lookupMap) throws IOException {
+        super(tag, description);
+    }
+
+    @Override
+    public IngestDocument execute(IngestDocument ingestDocument) throws Exception{
+        String originalContent = ingestDocument.getFieldValue(field, String.class);
+        ingestDocument.setFieldValue(field, "Hello world");
+    }
+
+    @Override
+    public String getType() {
+        // TODO your job!
+    }
+
+    String getField() {
+        // TODO your job!
+    }
+
+
+    public static final class Factory implements Processor.Factory {
+
+        @Override
+        public LookupProcessor create(Map<String, Processor.Factory> factories, String tag,
+                                      String description, Map<String, Object> config)
+                throws Exception {
+            String field = readStringProperty(TYPE, tag, config, "field");
+
+            // TODO your job! Also initialize the lookup processor properly if needed, after you changed the constructor
+        }
+    }
+}
+

src/main/plugin-metadata/plugin-security.policy

@@ -0,0 +1,23 @@
+/*
+ * Copyright [2021] [your_name]
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// add your custom permissions here
+grant {
+//    permission java.lang.RuntimePermission "setFactory";
+//    permission java.util.PropertyPermission "*", "read,write";
+//  permission org.elasticsearch.secure_sm.ThreadPermission "modifyArbitraryThreadGroup";
+};

src/test/java/usi/vaa/elasticsearch/plugin/ingest/lookup/LookupProcessorFactoryTests.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright [2021] [your_name]
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package usi.vaa.elasticsearch.plugin.ingest.lookup;
+
+import org.elasticsearch.ElasticsearchParseException;
+import org.elasticsearch.test.ESTestCase;
+import org.junit.BeforeClass;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import static org.hamcrest.Matchers.equalTo;
+
+public class LookupProcessorFactoryTests extends ESTestCase {
+
+    @BeforeClass
+    public static void defaultSettings() {
+        // TODO your job!
+    }
+
+    private Map<String, Object> getDefaultConfig() {
+        // TODO your job!
+    }
+
+    public void testDefaultConfiguration() throws Exception{
+        // TODO your job!
+    }
+
+    public void testInvalidConfiguration() throws Exception{
+        // TODO your job!
+    }
+
+}

src/test/java/usi/vaa/elasticsearch/plugin/ingest/lookup/LookupProcessorTests.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright [2021] [your_name]
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+
+package usi.vaa.elasticsearch.plugin.ingest.lookup;
+
+import org.elasticsearch.ingest.IngestDocument;
+import org.elasticsearch.ingest.RandomDocumentPicks;
+import org.elasticsearch.test.ESTestCase;
+import org.junit.BeforeClass;
+import java.util.HashMap;
+import java.util.Map;
+
+import static org.hamcrest.Matchers.equalTo;
+
+public class LookupProcessorTests extends ESTestCase {
+
+
+    @BeforeClass
+    public static void defaultSettings() {
+        // TODO your job!
+    }
+
+    public void testSimple() throws Exception{
+        // TODO your job!
+    }
+
+    public void testEmptyField() throws Exception{
+        // TODO your job!
+    }
+
+}

src/yamlRestTest/java/usi/vaa/elasticsearch/plugin/ingest/lookup/LookupRestIT.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright [2021] [your_name]
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package usi.vaa.elasticsearch.plugin.ingest.lookup;
+
+import com.carrotsearch.randomizedtesting.annotations.Name;
+import com.carrotsearch.randomizedtesting.annotations.ParametersFactory;
+import org.elasticsearch.test.rest.yaml.ClientYamlTestCandidate;
+import org.elasticsearch.test.rest.yaml.ESClientYamlSuiteTestCase;
+
+public class LookupRestIT extends ESClientYamlSuiteTestCase {
+
+    public LookupRestIT(@Name("yaml") ClientYamlTestCandidate testCandidate) {
+        super(testCandidate);
+    }
+
+    @ParametersFactory
+    public static Iterable<Object[]> parameters() throws Exception {
+        return ESClientYamlSuiteTestCase.createParameters();
+    }
+}

src/yamlRestTest/resources/rest-api-spec/test/ingest-lookup/10_basic.yml

@@ -0,0 +1,11 @@
+"ingest-lookup plugin installed":
+    - do:
+        cluster.state: {}
+
+    - set: {master_node: master}
+
+    - do:
+        nodes.info: {}
+
+    - match:  { nodes.$master.plugins.0.name: ingest-lookup }
+    - match:  { nodes.$master.ingest.processors.0.type: lookup }

src/yamlRestTest/resources/rest-api-spec/test/ingest-lookup/20_lookup_processor.yml

@@ -0,0 +1,35 @@
+---
+"Test lookup processor with defaults":
+  - do:
+      ingest.put_pipeline:
+        id: "my_pipeline"
+        body:  >
+          {
+            "description": "A pipeline to ingest data and apply a lookup",
+            "processors": [
+            {
+              "lookup" : {
+                "field" : "field1",
+                "lookup-map" : {
+                  "C001":"tyre" ,
+                  "C010":"front wing",
+                  "C100":"damper"
+                }
+              }
+            }
+            ]
+          }
+  - match: { acknowledged: true }
+
+  - do:
+      index:
+        index: test
+        id: 1
+        pipeline: "my_pipeline"
+        body: {field1: "Need to optimize the C001 temperature. C010 needs to be changed as it is damaged. C100 seems ok."}
+
+  - do:
+      get:
+        index: test
+        id: 1
+  - match: { _source.field1: "Need to optimize the tyre temperature. front wing needs to be changed as it is damaged. damper seems ok." }