Kibana forcemerge time out

I try to delete some old data to clean storage space, I use "POST /index/_forcemerge?only_expunge_deletes=true" in Kibana after a delete-by-query, but I get a 502 time out error everytime, what is wrong here?

What version of things are you running?

5.5.2

Is there anything in the Elasticsearch logs at the time you ran this?

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