SOLR-5226: add lucene index heap usage to the solr admin UI

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1530169 13f79535-47bb-0310-9956-ffa450edef68

solr/CHANGES.txt

@@ -89,6 +89,9 @@ New Features
 * SOLR-5300: Shards can be split by specifying arbitrary number of hash ranges
   within the shard's hash range. (shalin)
 
+* SOLR-5226: Add Lucene index heap usage to the Solr admin UI. 
+  (Areek Zillur via Robert Muir)
+
 Bug Fixes
 ----------------------
 * SOLR-4590: Collections API should return a nice error when not in SolrCloud mode.

solr/webapp/web/js/scripts/dashboard.js

@@ -112,6 +112,7 @@ sammy.get
                                 
               var data = {
                 'index_num-docs' : response['index']['numDocs'],
+                'index_heap-usage-bytes' : response['index']['indexHeapUsageBytes'],
                 'index_max-doc' : response['index']['maxDoc'],
                 'index_deleted-docs' : response['index']['deletedDocs'],
                 'index_version' : response['index']['version'],

solr/webapp/web/tpl/dashboard.html

@@ -39,6 +39,9 @@ limitations under the License.
           <dt class="index_max-doc">Max Doc:</dt>
             <dd class="index_max-doc value"></dd>
 
+          <dt class="index_heap-usage-bytes">Heap Memory Usage:</dt>
+            <dd class="index_heap-usage-bytes value"></dd>
+
           <dt class="index_deleted-docs">Deleted Docs:</dt>
             <dd class="index_deleted-docs value"></dd>