Elasticsearch: Discontinue EOL version 7.4 support

Remove support for elasticsearch V7_4, as it became EOL since April [1].

[1] https://www.elastic.co/support/eol

Change-Id: I9a0d1e7ff6f49aa89479538817dc5836f06066a4
3 files changed
tree: 072a7c6b21e6d47f91fa95ea7bebfea46ecb1e16
  1. java/
  2. javatests/