DATAES-94 - upgrade to latest elasticsearch 1.7.3 driver

Author: mohsinh

pom.xml

@@ -23,7 +23,7 @@
 
         <commonscollections>3.2.1</commonscollections>
         <commonslang>2.6</commonslang>
-        <elasticsearch>1.7.2</elasticsearch>
+        <elasticsearch>1.7.3</elasticsearch>
         <springdata.commons>1.12.0.BUILD-SNAPSHOT</springdata.commons>
 
     </properties>