Bump 6.8 branch to 6.8.1

This commit bumps the 6.8 branch to version 6.8.1.

Author: jasontedor

README.md

@@ -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>6.8.0-SNAPSHOT</version>
+  <version>6.8.1-SNAPSHOT</version>
 </dependency>
 ```
 

buildSrc/esh-version.properties

@@ -1,2 +1,2 @@
-eshadoop        = 6.8.0
-elasticsearch   = 6.8.0-SNAPSHOT
+eshadoop        = 6.8.1
+elasticsearch   = 6.8.1-SNAPSHOT

docs/src/reference/asciidoc/index.adoc

@@ -12,7 +12,7 @@
 :ref:  	http://www.elastic.co/guide/en/elasticsearch/reference/5.0
 :description: Reference documentation of {eh}
 :ver:	6.8.0
-:ver-d: 6.8.0.BUILD-SNAPSHOT
+:ver-d: 6.8.1.BUILD-SNAPSHOT
 :es-v:	6.8.0
 :sp-v:	2.2.0
 :st-v:	1.0.1