I am currently trying to reduce the number of shards on the cluster by reindexing our indices. We are of course also reviewing the indices so we can adjust the templates so that the daily indices will be created with the number of shards they really need.
What am I trying to do is reindex more then one index into a single one :
"index": ["index-a-2019.04.0*", "index-b-2019.04.0*"]
For some reason the process starts without a problem but will stop after a while before reindexing all of the documents.
Am I doing something wrong here?