[DOCS] Adds h2.

Author: szabosteve

docs/index-custom-title-page.html

@@ -56,6 +56,9 @@
   <div class="row my-4">
     <div class="col-md-6 col-12">
       <p></p>
+      <p>
+        Dodumentation for the official Java client
+      </p>
       <p>
         The Java API client provides strongly typed requests and responses for all Elasticsearch APIs.
       </p>