Revert "Bump version to 6.8.11 (#1485)"

This reverts commit 764c36d.

Author: csoulios

README.md

@@ -19,14 +19,14 @@ ES-Hadoop 2.0.x and 2.1.x are compatible with Elasticsearch __1.X__ *only*
 
 ## Installation
 
-### Stable Release (currently `6.8.10`)
+### Stable Release (currently `6.8.9`)
 Available through any Maven-compatible tool:
 
 ```xml
 <dependency>
   <groupId>org.elasticsearch</groupId>
   <artifactId>elasticsearch-hadoop</artifactId>
-  <version>6.8.10</version>
+  <version>6.8.9</version>
 </dependency>
 ```
 or as a stand-alone [ZIP](http://www.elastic.co/downloads/hadoop).
@@ -38,7 +38,7 @@ Grab the latest nightly build from the [repository](http://oss.sonatype.org/cont
 <dependency>
   <groupId>org.elasticsearch</groupId>
   <artifactId>elasticsearch-hadoop</artifactId>
-  <version>6.8.11-SNAPSHOT</version>
+  <version>6.8.10-SNAPSHOT</version>
 </dependency>
 ```
 

buildSrc/esh-version.properties

@@ -1,2 +1,2 @@
-eshadoop        = 6.8.11
-elasticsearch   = 6.8.11-SNAPSHOT
+eshadoop        = 6.8.10
+elasticsearch   = 6.8.10-SNAPSHOT