NUTCH-3008 indexer-elastic: downgrade to ES 7.10.2 to address licensing issues #806
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This PR downgrades the ES client to version 7.10.2 which is licensed under ASF 2.0 - it's a quick fix to stay compatible with ASF policies.
Not yet tested: indexing into ES
To be done: update the LICENSE and NOTICE files. I'll do this as part of a separate issue NUTCH-3035.