The index.codec setting for "best_compression" option, is marked as experimental in the 2.1.1 docs: https://www.elastic.co/guide/en/elasticsearch/reference/2.1/index-modules.html#_static_index_settings
Is this in fact still experimental? Seems like it is being marketed & discussed enough to be here to stay.
I'm asking, because I'd like to use it, but not if it will cause problems down the road if it is removed. E.g. if I setup my index to use best_compression and then in 2.xxxxx it is removed what would I have to do to overcome that? Reindex all data in order to upgrade?