I have 10 indices of 2 TB size each on ES 7.7 version. Lucene version of those indices is around 7.x. I want to update Lucene version of these indices to latest version that is 8.5?
I am aware of following options:
- reindexing but it is slow due size.
- _upgrade api. ES document says it will be removed but I tried running it and it is running. This is also very slow. Took around 4 hours to upgrade one index.
Please suggest me some better way to upgrade lucene version of existing indices.