Exclude commons-logging dependency from Elasticsearch dependencies.

Original Pull Request #1993
Closes #1989

Author: sothawo

pom.xml

@@ -145,13 +145,25 @@
 			<groupId>org.elasticsearch.client</groupId>
 			<artifactId>transport</artifactId>
 			<version>${elasticsearch}</version>
+			<exclusions>
+				<exclusion>
+					<groupId>commons-logging</groupId>
+					<artifactId>commons-logging</artifactId>
+				</exclusion>
+			</exclusions>
 		</dependency>
 
 		<dependency>
 			<!-- required by elasticsearch -->
 			<groupId>org.elasticsearch.plugin</groupId>
 			<artifactId>transport-netty4-client</artifactId>
 			<version>${elasticsearch}</version>
+			<exclusions>
+				<exclusion>
+					<groupId>commons-logging</groupId>
+					<artifactId>commons-logging</artifactId>
+				</exclusion>
+			</exclusions>
 		</dependency>
 
 		<dependency>