Elasticsearch 5: Set dependency to version 5.5.1

This commit bumps the Elasticsearch dependency version of the
Elasticsearch 5 binding to version 5.5.1.

elasticsearch5/pom.xml

@@ -174,9 +174,9 @@ LICENSE file.
     <dependency>
       <!-- jna is supported in ES and will be used when provided
            otherwise a fallback is used -->
-      <groupId>net.java.dev.jna</groupId>
+      <groupId>org.elasticsearch</groupId>
       <artifactId>jna</artifactId>
-      <version>4.1.0</version>
+      <version>4.4.0</version>
     </dependency>
     <dependency>
       <groupId>com.yahoo.ycsb</groupId>
@@ -197,12 +197,12 @@ LICENSE file.
     <dependency>
       <groupId>org.apache.logging.log4j</groupId>
       <artifactId>log4j-api</artifactId>
-      <version>2.7</version>
+      <version>2.8.2</version>
     </dependency>
     <dependency>
       <groupId>org.apache.logging.log4j</groupId>
       <artifactId>log4j-core</artifactId>
-      <version>2.7</version>
+      <version>2.8.2</version>
     </dependency>
     <dependency>
       <groupId>junit</groupId>

pom.xml

@@ -92,7 +92,7 @@ LICENSE file.
     <thrift.version>0.8.0</thrift.version>
     <hypertable.version>0.9.5.6</hypertable.version>
     <elasticsearch-version>2.4.4</elasticsearch-version>                                                                                                                                      
-    <elasticsearch5-version>5.2.0</elasticsearch5-version>
+    <elasticsearch5-version>5.5.1</elasticsearch5-version>
     <couchbase.version>1.4.10</couchbase.version>
     <couchbase2.version>2.3.1</couchbase2.version>
     <tarantool.version>1.6.5</tarantool.version>