Question about "forcemerge" policy

I want to know the policy of "forcemerge".
(I am using Elasticsearch 6.5.2 version)

For all I know, the automatic merge is following with TieredMergePolicy of Lucene,
And some conditions can trigger merge action (e.g., total segments number is over allowed segments number..)

My question is that "forcemerge" is also followed with TieredMergePolicy ?
As it were, if total segments number is under allowed segements number and there is no deleted documents,
Doesn't "forcemerge" also trigger any merge action?

When I set "forcemerge" for an index, I often couldn't see any merge action for it.
I am guessing that index doesn't reach the condition to trigger merge..

Could you help me?


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