HTTP/1.1 200 OK
Warning: 299 Elasticsearch-6.6.2-3bd3e59 "the default number of shards will change from [5] to [1] in 7.0.0; if you wish to continue using the default of [5] shards, you must manage this on the create index request or with an index template" "Wed, 17 Apr 2019 09:12:11 GMT"
content-type: application/json; charset=UTF-8
content-length: 63
{"acknowledged":true,"shards_acknowledged":true,"index":"demo"}
Also, yes it does work if you remove the "a" which would result in an incorrect date format.
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