Thanks a lot for your reply.
I don't get any error message.
The REINDEX step is very slow (2000/s) for the mixed index and fails after running for a few days.
Everytime indexing fails or the cluster is restarted the shards settings and replica declared for the Indices is reset to 1 (default values for es-7) and thus I have to recreate new indices after disabling old ones.
is there any better way to reindex fast?