Delete documents by query and disk storage

Elastic Stack Elasticsearch
1

Hi,

I use Delete by Query API to delete old documents.
On the monitoring console, I can see the storage size of the index was not changed.
I can see the file for this index in DATA folder is still present.
If the index contains zero document, will be deleted or not ?

Thank you
Arnaud

2

Delete just marks docs as deleted. It doesn't reclaim any space. Segment merging done automatically/periodically by Lucene reduces the disk usage. This is not the ideal way to retire old documents.

The best way to deal with expiring old documents is via time-based indices and index lifecycle management.

3

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