[CI] Frequent failure of WatcherRestIT painless/50_update_scripts/Test condition scripts are updated on execution

[mark-vieira]

We are getting frequent failures of painless/50_update_scripts/Test condition scripts are updated on execution} 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%2F50_update_scripts%2FTest%20condition%20scripts%20are%20updated%20on%20execution%7D"'),sort:!(time,desc))

Example: https://gradle-enterprise.elastic.co/s/zc2v7np5oofi6/tests/6ej7h6toy4af6-qkrsuwjuipy72

[elasticmachine]

Pinging @elastic/es-core-infra

[elasticmachine]

Pinging @elastic/es-core-features

[mark-vieira]

Muted on master in 8b92ca2.