Optimize Elasticsearch index

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Due to low disk space and a large amount of deleted documents inside one of my index, I need to do an optimize command (ElasticSearch 1.7)

Right now, the index has the following stats:

shards: 15 * 1 | docs: 23,165,760 | size: 1.25TB

  • Will the optimize API block any indexing/query operation untill the optimization is done?
  • Will the optimize API affects operations on the other indexes?
  • Is it possible to have an approximate time to know how long it will take?

Sorry for my bad english :)

And let me know if you need any further stats

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