Is it possible to merge the indices from two environments with different versions of elasticsearch (5.4.0 and 5.4.3) .
you could use reindex from remote from the first cluster and then run another reindex from remote from the second cluster. However that of course means, that last write wins and overwrites previously existing documents (or does not write by itself, depending on configuration).
Anything more advanced needs to be developed by yourself, i.e. merging half the fields from one side and the other from the second side.
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