Fix: build OpenSearch with the correct Java/Gradle combination.

Signed-off-by: dblock <dblock@amazon.com>

.github/workflows/test_unreleased.yml

@@ -14,7 +14,10 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        opensearch_ref: [ '1.x', '2.x', 'main' ]
+        entry:
+          - { opensearch_ref: "1.x", java: 11 }
+          - { opensearch_ref: "2.x", java: 11, gradle-runtime: 17 }
+          - { opensearch_ref: "main", java: 11, gradle-runtime: 17 }
     steps:
       - name: Checkout PHP Client
         uses: actions/checkout@v4
@@ -26,7 +29,7 @@ jobs:
           extensions: yaml, zip, curl
         env:
           COMPOSER_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-    
+
       - name: Install dependencies
         run: |
           composer install --prefer-dist
@@ -35,7 +38,7 @@ jobs:
         uses: actions/checkout@v4
         with:
           repository: opensearch-project/OpenSearch
-          ref: ${{ matrix.opensearch_ref }}
+          ref: ${{ matrix.entry.opensearch_ref }}
           path: opensearch
 
       - name: Get OpenSearch branch top
@@ -50,16 +53,28 @@ jobs:
           path: opensearch/distribution/archives/linux-tar/build/distributions
           key: ${{ steps.get-key.outputs.key }}
 
-      - uses: actions/setup-java@v4
-        if: steps.cache-restore.outputs.cache-hit != 'true'
+      - name: Set up Java
+        uses: actions/setup-java@v4
+        with:
+          java-version: ${{ matrix.entry.java }}
+          distribution: temurin
+
+      - name: Set up Gradle JDK runtime
+        if: matrix.entry.gradle-runtime && matrix.entry.gradle-runtime != matrix.entry.java
+        uses: actions/setup-java@v4
         with:
-          distribution: "temurin"
-          java-version: "21"
+          java-version: ${{ matrix.entry.gradle-runtime }}
+          distribution: temurin
+
+      - name: Set JAVA${{ matrix.entry.java }}_HOME
+        shell: bash
+        run: |
+          echo "JAVA${{ matrix.entry.java }}_HOME=$JAVA_HOME_${{ matrix.entry.java }}_${{ runner.arch }}" >> $GITHUB_ENV
 
       - name: Assemble OpenSearch
         if: steps.cache-restore.outputs.cache-hit != 'true'
         working-directory: opensearch
-        run: ./gradlew :distribution:archives:linux-tar:assemble --warning-mode none
+        run: ./gradlew :distribution:archives:linux-tar:assemble -Druntime.java=${{ matrix.entry.java }}
 
       - name: Save cached build
         if: steps.cache-restore.outputs.cache-hit != 'true'
@@ -73,12 +88,12 @@ jobs:
         run: |
           tar xf opensearch-min-*
           ./opensearch-*/bin/opensearch -d
-      
+
       - name: Wait for Search server
         run: php ./.github/wait_for_opensearch.php
 
       - name: Integration tests
         run: |
           composer run integration-min
         env:
-          OPENSEARCH_URL: 'http://localhost:9200'
+          OPENSEARCH_URL: "http://localhost:9200"