Currently, I try to use reindex from remote to migrate indices from your old cluster to a new 7.1.0 cluster. However, ES 7.1 does not support booleans like 1 and 0 anymore so that the reindexing fails. My problem is similar to Reindex from 2.4 to 6.5 failed on boolean type
The solution is to create a pipeline with a processor that converts integers to proper booleans. My question is: How do I a create a pipeline with such a processor?