The replication factor process is not complete?

we have 3 indexers, since two weeks ago 2 indexers down, after 2 weeks from repair the servers became UP, but there is a delay in the replication factor process? is this normal or not?
There is a decrease in the number of buckets but it is very few and may take days , but we need the quick solve?

Splunk Version 6.6.5 instillation on Linux servers Version 3.10.0-514.e17.x86_64.

please we need your support.
Thank you

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