Data lost

my elasticsearch server crashed after a get query, and then the server recovered, but some doc's _source field lost and some doc's _source field lost for replica shard and some lost at primary shard.
is there any one known what has happened?

my elasticsearch server crashed after a get query

Looks strange. Do you have logs of the server? Can you share them?

some doc's _source field lost

WDYM? That the document is still here but with no _source content? Or that the document does not exist at all?

is there any one known what has happened?

No. You need to share your logs and version at least.

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