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. Is 
-Des.index.store.type=memory the ElasticSearch equivalent of ensure 
RAMDirectory is used underline?

$ curl -XPUT http://localhost:9200/myindex/ -d \
'
index :
    store:
        type: memory
'

Thanks,
-Mark

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