How does the best_compression work after I setting it?

Elastic Stack Elasticsearch
#1

I am working on index compression currently. Now I have existed index about 500MB to be compressed, but I meet the following questions:

  1. When does the best_compression work after I setting it? Immediately or after a while?
  2. Does it work on existed index or the upcoming index data? Or both?
  3. Have the index data been compressed by LZ4 if I don't set the index.codec ?

Thanks.

#2

By default we use LZ4.

To change this setting you need to close, update, reopen and then issue a force merge on the index in question for it to be applied. Otherwise if you move an index to a node that has that set in it's config, then issue a force merge, it'll be applied.

We should really make this clearer in the docs!

#3

https://github.com/elastic/elasticsearch/issues/23646 :slight_smile:

#4

Thanks! Actually the issue in Github is submitted by me. LOL

#5

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