_forcemerge blocking at the node or cluster level

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?

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

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

The client will not return until the forcemerge is complete.

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