Updating baseline JDK version to JDK-21

.github/workflows/maven-publish.yml

@@ -20,7 +20,7 @@ jobs:
       - uses: actions/setup-java@v3
         with:
           distribution: temurin # Temurin is a distribution of adoptium
-          java-version: 11
+          java-version: 21
       - uses: actions/checkout@v3
       - uses: aws-actions/configure-aws-credentials@v1
         with:

.github/workflows/multi-node-test-workflow.yml

@@ -44,7 +44,7 @@ jobs:
         uses: actions/setup-java@v2
         with:
           distribution: temurin # Temurin is a distribution of adoptium
-          java-version: 17
+          java-version: 21
       # index-management
       - name: Checkout Branch
         uses: actions/checkout@v2

.github/workflows/test-and-build-workflow.yml

@@ -24,7 +24,7 @@ jobs:
       fail-fast: false
       # This starts three jobs, setting these environment variables uniquely for the different jobs
       matrix:
-        java: [11, 17, 21]
+        java: [21]
         feature: [ism, non-ism]
         include:
           - feature: ism
@@ -88,7 +88,7 @@ jobs:
       fail-fast: false
       # This starts three jobs, setting these environment variables uniquely for the different jobs
       matrix:
-        java: [11, 17, 21]
+        java: [21]
         os: [windows-latest, macos-latest]
         feature: [ism, non-ism]
         include:

DEVELOPER_GUIDE.md

@@ -1,7 +1,7 @@
 - [Developer Guide](#developer-guide)
     - [Forking and Cloning](#forking-and-cloning)
     - [Install Prerequisites](#install-prerequisites)
-        - [JDK 11](#jdk-11)
+        - [JDK 21](#jdk-21)
     - [Setup](#setup)  
     - [Build](#build)
         - [Building from the command line](#building-from-the-command-line)
@@ -19,17 +19,17 @@ Fork this repository on GitHub, and clone locally with `git clone`.
 
 ### Install Prerequisites
 
-#### JDK 11
+#### JDK 21
 
-OpenSearch components build using Java 11 at a minimum. This means you must have a JDK 11 installed with the environment variable `JAVA_HOME` referencing the path to Java home for your JDK 11 installation, e.g. `JAVA_HOME=/usr/lib/jvm/jdk-11`.
+OpenSearch components build using Java 21 at a minimum. This means you must have a JDK 21 installed with the environment variable `JAVA_HOME` referencing the path to Java home for your JDK 21 installation, e.g. `JAVA_HOME=/usr/lib/jvm/jdk-21`.
 
-Download Java 11 from [here](https://adoptium.net/releases.html?variant=openjdk11).
+Download Java 21 from [here](https://adoptium.net/releases.html?variant=openjdk21).
 
 ## Setup
 
 1. Check out this package from version control.
 2. Launch Intellij IDEA, choose **Import Project**, and select the `settings.gradle` file in the root of this package.
-3. To build from the command line, set `JAVA_HOME` to point to a JDK >= 11 before running `./gradlew`.
+3. To build from the command line, set `JAVA_HOME` to point to a JDK >= 21 before running `./gradlew`.
 - Unix System
     1. `export JAVA_HOME=jdk-install-dir`: Replace `jdk-install-dir` with the JAVA_HOME directory of your system.
     2. `export PATH=$JAVA_HOME/bin:$PATH`

build.gradle

@@ -274,11 +274,11 @@ publishing {
 tasks.generatePomFileForPluginZipPublication.dependsOn publishNebulaPublicationToMavenLocal
 
 plugins.withId('java') {
-    sourceCompatibility = targetCompatibility = JavaVersion.VERSION_11
+    sourceCompatibility = targetCompatibility = JavaVersion.VERSION_21
 }
 
 plugins.withId('org.jetbrains.kotlin.jvm') {
-    compileKotlin.kotlinOptions.jvmTarget = compileTestKotlin.kotlinOptions.jvmTarget = JavaVersion.VERSION_11
+    compileKotlin.kotlinOptions.jvmTarget = compileTestKotlin.kotlinOptions.jvmTarget = JavaVersion.VERSION_21
     compileKotlin.dependsOn ktlint
 }