The main reason I can see is doc_values.
https://www.elastic.co/guide/en/elasticsearch/reference/current/doc-values.html
See also this thread: Index Size: Elasticsearch 1.4 -> 2.1
The main reason I can see is doc_values.
https://www.elastic.co/guide/en/elasticsearch/reference/current/doc-values.html
See also this thread: Index Size: Elasticsearch 1.4 -> 2.1
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