ilgrosso commented on issue #489: Errors with Elasticsearch 5.x URL: https://github.com/apache/incubator-ponymail/issues/489#issuecomment-480162345 It seems `scan`, `count` and others were [removed since ES 2.1](https://www.elastic.co/guide/en/elasticsearch/reference/2.1/breaking_21_search_changes.html).
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