Change "tweet" type to "_doc"
Elasticsearch 6.x indices do not allow multiple types index. Instead, they use "_doc" as default if created internally (Elasticsearch), or "doc" default if sent by Logstash.
The get API allows to get a typed JSON document from the index based on
its id. The following example gets a JSON document from an index called
-twitter, under a type called tweet, with id valued 0:
+twitter, under a type called _doc, with id valued 0:
[source,js]
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