Docs: Fix link to transport client

The transport client was linking to a page in maven central that didn't
have the transport client in it. This is better link and happens to be
the same link that the low and high level rest client use.

Author: nik9000

docs/java-api/index.asciidoc

@@ -27,7 +27,7 @@ The javadoc for the transport client can be found at {transport-client-javadoc}/
 == Maven Repository
 
 Elasticsearch is hosted on
-http://search.maven.org/#search%7Cga%7C1%7Ca%3A%22elasticsearch%22[Maven
+http://search.maven.org/#search%7Cga%7C1%7Cg%3A%22org.elasticsearch.client%22[Maven
 Central].
 
 For example, you can define the latest version in your `pom.xml` file: