Functional test in HasParentTest intermittently fails due to a lack in ES configuration #1306
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The problem with the docker image from ES version 5.2.2 is that is shipped with x-pack installed, I disabled security but I forgot to disable monitor which sometimes make this test failing.
At this time it's not possible to remove completely the xpack plugin (except with a workaround) due
to an issue in the official docker ES image : elastic/elasticsearch-docker#36. At the moment I've disabled security and monitoring from the elasticsearch.yml. The problem has been resolved (maybe) in the 5.4, my suggestion is to completely remove the plugin when we will switch to that version.