Kibana BAD Request on index pattern creation and use

after upgrading ELK from 4.5 to 5.4.3 we encountered the following error,
while trying to use or create some of the index patterns:
Request to Elasticsearch failed: Bad Request.
I found this related similar topic, but its closed without any answers:

any lead on what can cause this issue? and how to handle it?

Hi @Noam,

does either the network response in the browser dev tools or the Kibana server console show more details about that error? Usually Elasticsearch is very verbose about it.

OK I will check it out and post here the request and response

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