Bump elasticsearch-rest-client from 6.6.0 to 6.6.1 in /modules/elasti…

…csearch (#1259)

Bumps [elasticsearch-rest-client](https://github.com/elastic/elasticsearch) from 6.6.0 to 6.6.1.
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modules/elasticsearch/build.gradle

@@ -2,6 +2,6 @@ description = "TestContainers :: elasticsearch"
 
 dependencies {
     compile project(':testcontainers')
-    testCompile "org.elasticsearch.client:elasticsearch-rest-client:6.6.0"
+    testCompile "org.elasticsearch.client:elasticsearch-rest-client:6.6.1"
     testCompile "org.elasticsearch.client:transport:6.6.0"
 }