Update Elasticsearch testing version to 6.2.4 (#1501)

Author: ruflin

CHANGELOG.md

@@ -13,11 +13,12 @@ All notable changes to this project will be documented in this file based on the
 * Added support for pipeline when indexing document. [#1455](https://github.com/ruflin/Elastica/pull/1455)
 * Added support for multiple bucket sort orders for aggregations. [#1480](https://github.com/ruflin/Elastica/pull/1480)
 * Added basic support for the Elasticsearch Task Api
-* Added updateByQuery endpoint. [#1499](https://github.com/ruflin/Elastica/pull/1499) 
+* Added updateByQuery endpoint. [#1499](https://github.com/ruflin/Elastica/pull/1499)
 
 ### Improvements
 
 * Use `source` script field instead of deprecated (since ES 5.6) `inline` field. [#1497](https://github.com/ruflin/Elastica/pull/1497)
+* Updated Elasticsearch testing version to 6.2.4. [#1501](https://github.com/ruflin/Elastica/pull/1501)
 
 ### Deprecated
 

README.md

@@ -17,7 +17,7 @@ All library issues should go to the [issue tracker from github](https://github.c
 
 Compatibility
 -------------
-This release is compatible with all Elasticsearch 6.x releases. It was tested with version 6.0.0.
+This release is compatible with all Elasticsearch 6.x releases. It was tested with version 6.2.4.
 
 
 Contributing

env/elasticsearch/Dockerfile

@@ -1,4 +1,4 @@
-FROM docker.elastic.co/elasticsearch/elasticsearch:6.0.0
+FROM docker.elastic.co/elasticsearch/elasticsearch:6.2.4
 MAINTAINER Nicolas Ruflin <[email protected]>
 
 RUN /usr/share/elasticsearch/bin/elasticsearch-plugin install ingest-attachment