build(deps): bump elasticsearch-client.version from 6.2.3 to 7.12.0

Bumps `elasticsearch-client.version` from 6.2.3 to 7.12.0.

Updates `elasticsearch-rest-high-level-client` from 6.2.3 to 7.12.0
- [Release notes](https://github.com/elastic/elasticsearch/releases)
- [Commits](elastic/elasticsearch@v6.2.3...v7.12.0)

Updates `elasticsearch` from 6.2.3 to 7.12.0
- [Release notes](https://github.com/elastic/elasticsearch/releases)
- [Commits](elastic/elasticsearch@v6.2.3...v7.12.0)

Updates `elasticsearch-rest-client` from 6.2.3 to 7.12.0
- [Release notes](https://github.com/elastic/elasticsearch/releases)
- [Commits](elastic/elasticsearch@v6.2.3...v7.12.0)

Updates `parent-join-client` from 6.2.3 to 7.12.0
- [Release notes](https://github.com/elastic/elasticsearch/releases)
- [Commits](elastic/elasticsearch@v6.2.3...v7.12.0)

Updates `aggs-matrix-stats-client` from 6.2.3 to 7.12.0
- [Release notes](https://github.com/elastic/elasticsearch/releases)
- [Commits](elastic/elasticsearch@v6.2.3...v7.12.0)

Updates `rank-eval-client` from 6.2.3 to 7.12.0
- [Release notes](https://github.com/elastic/elasticsearch/releases)
- [Commits](elastic/elasticsearch@v6.2.3...v7.12.0)

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pom.xml

@@ -91,7 +91,7 @@
 		<hadoop-client.version>2.6.0</hadoop-client.version>
 		<hbase.version>1.2.5</hbase.version><!-- 2.1.3 -->
 		<kafka-clients.version>2.5.0</kafka-clients.version>
-		<elasticsearch-client.version>6.2.3</elasticsearch-client.version>
+		<elasticsearch-client.version>7.12.0</elasticsearch-client.version>
 		<!-- AI. -->
 		<!-- NLP (pinyin) -->
 		<belerweb.pinyin4j.version>2.5.1</belerweb.pinyin4j.version>