Use Jest for Elasticsearch http JanusGraph#92

Issue: JanusGraph#92

This adds http support to ElasticSearchIndex and removes support for the
Transport and Client modes. It also refactors the add/delete scripts to
use bindings since throwing a bunch of unique scripts at a Groovy
compiler isn't the best idea.

Signed-off-by: Keith Lohnes <krlohnes@us.ibm.com>

janusgraph-es/pom.xml

@@ -66,7 +66,24 @@
             <artifactId>antlr-runtime</artifactId>
             <version>${antlr.version}</version>
         </dependency>
-
+        <!--Bit of a hack here. Jest relies on a later version of gson. This
+          should be fine though. -->
+        <dependency>
+            <groupId>com.google.code.gson</groupId>
+            <artifactId>gson</artifactId>
+            <version>2.2.4</version>
+        </dependency>
+        <dependency>
+          <groupId>io.searchbox</groupId>
+          <artifactId>jest</artifactId>
+          <version>2.0.4</version><!-- change this to appropriate jar for ES 1.x -->
+          <exclusions>
+            <exclusion>  <!-- declare the exclusion here -->
+              <groupId>com.google.code.gson</groupId>
+              <artifactId>gson</artifactId>
+            </exclusion>
+          </exclusions>
+        </dependency>
         <!-- Logging backends.
              Enforce a classpath ordering constraint to ensure log4j is used for logging.
              See comment in janusgraph-cassandra POM for more information. -->

janusgraph-es/src/test/java/org/janusgraph/diskstorage/es/BerkeleyElasticsearchTest.java

@@ -45,7 +45,6 @@ public WriteConfiguration getConfiguration() {
         //Add index
         config.set(INDEX_BACKEND,"elasticsearch",INDEX);
         config.set(LOCAL_MODE,true,INDEX);
-        config.set(CLIENT_ONLY,false,INDEX);
         config.set(INDEX_DIRECTORY, StorageSetup.getHomeDir("es"), INDEX);
         return config.getConfiguration();