Kibana6.x.x---编译源码，在执行优化任务时，报警告

wangxuan@tryman:/home/kibana_git/kibana6.2.2$ yarn release
yarn run v1.5.1
$ grunt release
Running "_release:confirmUpload" task
Do you want to actually upload the files to s3 after building?, [N/y] N

Running "build" task

Running "clean:build" (clean) task
>>  path cleaned.

Running "clean:target" (clean) task
>>  paths cleaned.

Running "_build:downloadNodeBuilds" task
>> Downloading darwin-x86_64 and corresponding sha
>> Downloading linux-x86_64 and corresponding sha
>> Downloading windows-x86_64 and corresponding sha
>> linux-x86_64 downloaded and verified
>> darwin-x86_64 downloaded and verified
>> windows-x86_64 downloaded and verified

Running "_build:extractNodeBuilds" task

Running "copy:devSource" (copy) task
Created  directories, copied  files

Running "clean:devSourceForTestbed" (clean) task
>>  path cleaned.

Running "babel:build" (babel) task

Running "_build:plugins" task

Running "_build:data" task

Running "i18nextract:default_options" (i18nextract) task

Create file: build/i18n_extract/en.json
Statistics : empty:  (%) / Updated:  / Deleted:  / New: 

Running "_build:check" task

Running "_build:packageJson" task

Running "_build:readme" task

Running "_build:babelCache" task

Running "_build:installDependencies" task

Running "_build:notice" task

Running "_build:removePkgJsonDeps" task

Running "clean:testsFromModules" (clean) task
>>  paths cleaned.

Running "clean:examplesFromModules" (clean) task
>>  paths cleaned.

Running "run:optimizeBuild" (run) task
Warning: non-zero exit code  Use --force to continue.

Aborted due to warnings.
error An unexpected error occurred: "Command failed.
Exit code:
Command: sh
Arguments: -c grunt release
Directory: /home/kibana_git/kibana6.2.2
Output:
".
info If you think this is a bug, please open a bug report with the information provided in "/home/kibana_git/kibana6.2.2/yarn-error.log".
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

查看官网，FQ查看，都没有很好的解决方法，暂时记录下来。