[quote="hossein_ey, post:10, topic:85733"]
the most important issue is lost data in Insert?
[/quote]

Yes.

[quote="hossein_ey, post:10, topic:85733"]
or after data indexed in elasticsearch  something can goes wrong ?
[/quote]

Yes. The cluster can in some extreme conditions become RED which means that some primary shards are not available anymore.
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