Remove disable Xlint warning from gradle files.

[martijnvg]

There are a number of build.gradle files that specifically disable -Xlint warnings for both production and test code. This should be avoided, because that can mask real bugs.

The following build.gradle files should be checked:

• ./benchmarks/build.gradle
• ./client/client-benchmark-noop-api-plugin/build.gradle
• ./modules/ingest-common/build.gradle Remove -Xlint exclusions in the ingest-common module. #40505
• ./modules/ingest-geoip/build.gradle Remove -Xlint exclusions in the ingest-geoip module #40629
• ./modules/percolator/build.gradle Remove -Xlint exclusions in the percolator module. #40372
• ./modules/transport-netty4/build.gradle
• ./plugins/ingest-attachment/build.gradle Remove -Xlint exclusions in all plugins. #40721
• ./plugins/mapper-size/build.gradle Remove -Xlint exclusions in all plugins. #40721
• ./plugins/transport-nio/build.gradle Remove -Xlint exclusions in all plugins. #40721
• ./server/build.gradle
• ./test/framework/build.gradle Re-enable compiler warnings in :test:framework #75449
• ./x-pack/plugin/ccr/build.gradle Make -try xlint warning disabled by default. #40833
• ./x-pack/plugin/core/build.gradle Enable compiler warnings in xpack core plugin project #66899
• ./x-pack/plugin/data-frame/build.gradle [ML] Data Frame minor tidy ups #40548
• ./x-pack/plugin/ml/build.gradle Enable XLint warnings for ML  #44285
• ./x-pack/plugin/monitoring/build.gradle
• ./x-pack/plugin/rollup/build.gradle
• ./x-pack/plugin/security/build.gradle Enable compiler warnings in x-pack security #75473
• ./x-pack/plugin/watcher/build.gradle Enable compiler warnings for watcher #75516
• ./x-pack/qa/rolling-upgrade-basic/build.gradle
• ./x-pack/qa/rolling-upgrade/build.gradle
• ./x-pack/qa/third-party/active-directory/build.gradle
• (I may be missing a few files)

If possible both compileJava.options.compilerArgs and compileTestJava.options.compilerArgs should be removed. Removing compileTestJava.options.compilerArgs can be difficult, for example because of many tests having raw types or unchecked checks. So at least we should try to remove compileJava.options.compilerArgs in each of the above mentioned files.

By default the build disables the following warning: -path, -serial, -options , -deprecation. So if one of those warnings are also mentioned in a build.gradle file then that can be removed.

If you like to fix one of the above gradle files then post a comment which file you like to fix.