Update CI job environment in prep for Java 17 update

.ci/jobs.t/elastic+elasticsearch+multijob+packaging-tests-upgrade.yml

@@ -25,7 +25,7 @@
           properties-content: |
             JAVA_HOME=$HOME/.java/$ES_BUILD_JAVA
             RUNTIME_JAVA_HOME=$HOME/.java/$ES_RUNTIME_JAVA
-            JAVA15_HOME=$HOME/.java/openjdk15
+            JAVA16_HOME=$HOME/.java/openjdk16
       - shell: |
           #!/usr/local/bin/runbld --redirect-stderr
           ./.ci/os.sh --build-cache -Dorg.elasticsearch.build.cache.url=https://gradle-enterprise.elastic.co/cache/ destructiveDistroUpgradeTest.v$BWC_VERSION

.ci/jobs.t/elastic+elasticsearch+multijob+platform-support-arm.yml

@@ -24,7 +24,7 @@
             JAVA_HOME=$HOME/.java/$ES_BUILD_JAVA
             RUNTIME_JAVA_HOME=$HOME/.java/$ES_RUNTIME_JAVA
             JAVA11_HOME=$HOME/.java/jdk11
-            JAVA15_HOME=$HOME/.java/jdk15
+            JAVA16_HOME=$HOME/.java/jdk16
       - shell: |
           #!/usr/local/bin/runbld --redirect-stderr
           $WORKSPACE/.ci/scripts/run-gradle.sh -Dbwc.checkout.align=true check

.ci/jobs.t/elastic+elasticsearch+multijob+platform-support-darwin.yml

@@ -11,7 +11,7 @@
             JAVA_HOME=$HOME/.java/$ES_BUILD_JAVA
             RUNTIME_JAVA_HOME=$HOME/.java/$ES_RUNTIME_JAVA
             JAVA11_HOME=$HOME/.java/java11
-            JAVA15_HOME=$HOME/.java/openjdk15
+            JAVA16_HOME=$HOME/.java/openjdk16
       - shell: |
           #!/usr/local/bin/runbld --redirect-stderr
           $WORKSPACE/.ci/scripts/run-gradle.sh -Dbwc.checkout.align=true check

.ci/jobs.t/elastic+elasticsearch+multijob+platform-support-unix.yml

@@ -36,7 +36,7 @@
             JAVA_HOME=$HOME/.java/$ES_BUILD_JAVA
             RUNTIME_JAVA_HOME=$HOME/.java/$ES_RUNTIME_JAVA
             JAVA11_HOME=$HOME/.java/java11
-            JAVA15_HOME=$HOME/.java/openjdk15
+            JAVA16_HOME=$HOME/.java/openjdk16
       - shell: |
           #!/usr/local/bin/runbld --redirect-stderr
           $WORKSPACE/.ci/scripts/run-gradle.sh -Dbwc.checkout.align=true check

.ci/jobs.t/elastic+elasticsearch+multijob+platform-support-windows.yml

@@ -35,7 +35,7 @@
             JAVA_HOME=$USERPROFILE\\.java\\$ES_BUILD_JAVA
             RUNTIME_JAVA_HOME=$USERPROFILE\\.java\\$ES_RUNTIME_JAVA
             JAVA11_HOME=$USERPROFILE\\.java\\java11
-            JAVA15_HOME=$USERPROFILE\\.java\\openjdk15
+            JAVA16_HOME=$USERPROFILE\\.java\\openjdk16
       - batch: |
           del /f /s /q %USERPROFILE%\.gradle\init.d\*.*
           mkdir %USERPROFILE%\.gradle\init.d

.ci/jobs.t/elastic+elasticsearch+periodic+ear.yml

@@ -12,7 +12,7 @@
             JAVA_HOME=$HOME/.java/$ES_BUILD_JAVA
             RUNTIME_JAVA_HOME=$HOME/.java/$ES_RUNTIME_JAVA
             JAVA11_HOME=$HOME/.java/java11
-            JAVA15_HOME=$HOME/.java/openjdk15
+            JAVA16_HOME=$HOME/.java/openjdk16
       - shell: |
           #!/bin/bash
           # Configure a dm-crypt volume backed by a file

.ci/jobs.t/elastic+elasticsearch+periodic+release-tests.yml

@@ -13,7 +13,7 @@
             JAVA_HOME=$HOME/.java/$ES_BUILD_JAVA
             RUNTIME_JAVA_HOME=$HOME/.java/$ES_RUNTIME_JAVA
             JAVA11_HOME=$HOME/.java/java11
-            JAVA15_HOME=$HOME/.java/openjdk15
+            JAVA16_HOME=$HOME/.java/openjdk16
       - shell: |
           #!/usr/local/bin/runbld --redirect-stderr
 

.ci/templates.t/generic-gradle-unix.yml

@@ -11,7 +11,7 @@
             JAVA_HOME=$HOME/.java/$ES_BUILD_JAVA
             RUNTIME_JAVA_HOME=$HOME/.java/$ES_RUNTIME_JAVA
             JAVA11_HOME=$HOME/.java/java11
-            JAVA15_HOME=$HOME/.java/openjdk15
+            JAVA16_HOME=$HOME/.java/openjdk16
       - shell: |
           #!/usr/local/bin/runbld --redirect-stderr
           $WORKSPACE/.ci/scripts/run-gradle.sh {gradle-args}

.ci/templates.t/matrix-gradle-unix.yml

@@ -26,7 +26,7 @@
             JAVA_HOME=$HOME/.java/$ES_BUILD_JAVA
             RUNTIME_JAVA_HOME=$HOME/.java/$ES_RUNTIME_JAVA
             JAVA11_HOME=$HOME/.java/java11
-            JAVA15_HOME=$HOME/.java/openjdk15
+            JAVA16_HOME=$HOME/.java/openjdk16
       - shell: |
           #!/usr/local/bin/runbld --redirect-stderr
           $WORKSPACE/.ci/scripts/run-gradle.sh {gradle-args}