examples/elasticsearch: fix awkward sentence

examples/elasticsearch/README.md

@@ -43,7 +43,7 @@ Current Elasticsearch version is `1.7.1`.
 
 ## Docker image
 
-This example uses [this pre-built image](https://github.com/pires/docker-elasticsearch-kubernetes) will not be supported. Feel free to fork to fit your own needs, but mind yourself that you will need to change Kubernetes descriptors accordingly.
+The [pre-built image](https://github.com/pires/docker-elasticsearch-kubernetes) used in this example will not be supported. Feel free to fork to fit your own needs, but keep in mind that you will need to change Kubernetes descriptors accordingly.
 
 ## Deploy