[CI] Frequent failure of WatcherRestIT painless/10_basic/Test execute watch api

[mark-vieira]

The WatcherRestIT.test {yaml=painless/10_basic/Test execute watch api} is failing frequently in CI.

https://build-stats.elastic.co/app/kibana#/discover?_g=(refreshInterval:(pause:!t,value:0),time:(from:now-7d,mode:quick,to:now))&_a=(columns:!(branch,test),index:e58bf320-7efd-11e8-bf69-63c8ef516157,interval:auto,query:(language:kuery,query:'class%20:%20"org.elasticsearch.smoketest.WatcherRestIT"%20and%20test:%20"test%20%7Byaml%3Dpainless%2F10_basic%2FTest%20execute%20watch%20api%7D"'),sort:!(time,desc))

Example: https://gradle-enterprise.elastic.co/s/aumtr2amc27i2/tests/6ej7h6toy4af6-6g5rmtb4agtbo

[elasticmachine]

Pinging @elastic/es-core-infra

[elasticmachine]

Pinging @elastic/es-core-features

[mark-vieira]

Muted on master in eae77c9.