Is ES es.index.store.type=memory equivalent to Lucene's RAMDirectory?

I would like to use MMapDirectory at the data indexing phase (in a batch). And then switch to index to in-memory and read only at time of serving real user queries to optimize the search latency. I used to achieve that when directly deal with Lucene by using RAMDirectory and read-only Searcher.

Re: Is ES es.index.store.type=memory equivalent to Lucene's RAMDirectory?

Hi Jörg, Does ES allow switching from file-based store to memory-based store without re-indexing? We used to use file-based store to run a batch index, then switch to read-only memory-based index when using Lucene directly. We've found that read-only RAMDirectory is 20% faster than