_forcemerge blocking at the node or cluster level

Elastic Stack Elasticsearch
1

When the documentation says it's blocking messages. Is this at the node or cluster level. If I'm forcemerging one index will I be able to index into other indices?

2

Yes. But a long-running forcemerge is usually a disk I/O heavy operation, so indexing may be slower than normal.

3

Thanks that's good to know! But what does it mean by blocking messages?

4

The client will not return until the forcemerge is complete.

5

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