How does es fetch the right source with stale docIDs, after lucene merged queried segments

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1

Deleted documents are dropped when segments are merged, which will change the follows' docID.
so how does es fetch the right source with stale docIDs.

2

It keeps hold of the old segments until all the searches that are using them have finished.

3

How to hold？
I don't find any filter to skip segments using by searches in findMerges source code.

4

It works because org.apache.lucene.index.IndexReader is ref-counted, and we use the same IndexReader for all phases of a search.

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5

Thanks, it's resolved my puzzle.

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