Require JDK 11 for compilation (#34103)

Now that JDK 11 is GA, we would switch our 6.x and master branches to
the JDK 11 compiler. This commit makes this change, as well as removes
JDK 10 from the CI configuration.

.ci/java-versions.properties

@@ -4,5 +4,5 @@
 # build and test Elasticsearch for this branch. Valid Java versions
 # are 'java' or 'openjdk' followed by the major release number.
 
-ES_BUILD_JAVA=java10
+ES_BUILD_JAVA=java11
 ES_RUNTIME_JAVA=java8

.ci/matrix-build-javas.yml

@@ -6,5 +6,4 @@
 # or 'openjdk' followed by the major release number.
 
 ES_BUILD_JAVA:
-  - java10
   - java11

.ci/matrix-runtime-javas.yml

@@ -8,5 +8,4 @@
 ES_RUNTIME_JAVA:
   - java8
   - java8fips
-  - java10
   - java11

buildSrc/src/main/resources/minimumCompilerVersion

@@ -1 +1 @@
-1.10
+1.11