Log Message:
Update databases/elasticsearch to 6.1.2

== 6.1.2

=== Enhancements

Internal::
- Make AbstractQueryBuilder.declareStandardFields to be protected

=== Bug fixes

Aggregations::
- Fix incorrect results for aggregations nested under a nested
  aggregation
- Fix composite aggregation when after term is missing in the shard
- Fix preserving FiltersAggregationBuilder#keyed field on rewrite

Engine::
- Use `_refresh` to shrink the version map on inactivity
- Allow resize version map under lock even if there are pending
  operations

Network::
- Only bind loopback addresses when binding to local

Recovery::
- Allow shrinking of indices from a previous major

Search::
- Use the underlying connection version for CCS connections
- Carry forward weights, etc on rescore rewrite

Snapshot/Restore::
- Fail restore when the shard allocations max retries count is reached

Translog::
- Only sync translog when global checkpoint increased

== 6.1.1

=== Enhancements

Snapshot/Restore::
- Use AmazonS3.doesObjectExist() method in S3BlobContainer

=== Bug fixes

Inner Hits::
- Add version support for inner hits in field collapsing

Java REST Client::
- Do not use system properties when building the HttpAsyncClient

Search::
- Fix routing with leading or trailing whitespace

Sequence IDs::
- Recovery from snapshot may leave seq# gaps
- No longer unidle shard during recovery

=== Upgrades

Ingest::
- update ingest-attachment to use Tika 1.17 and newer deps