How to check, when replicas are really created

Elastic Stack Elasticsearch
1

I use ElasticSeach 6.5
To change index mappings I am issuing reindexing operation.
For faster reindexing, I set number_of_replicas to 0 for a new index (that I am reindexing into).
After reindexing is finished I set number_of_replicas to 1. But this operation (setting of index parameter) returns immediately. Because of that, I think, that right after this post replicas are not created fully. It's too fast for big index.
How to check if replicas are really fully created and populated, so I can delete the old index and be sure, that data is safe in case of some of the node's failure?

2

You should wait for the cluster health to report green, indicating that all replicas have been successfully allocated.

3

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