update deprecated method calls and add remove from search index method

uplusmessaging/util/searching.py

@@ -98,8 +98,16 @@ def delete_all_in_index(index_name):
     while True:
         # Get a list of documents populating only the doc_id field and extract the ids.
         document_ids = [document.doc_id
-                        for document in doc_index.list_documents(ids_only=True)]
+                        for document in doc_index.get_range(ids_only=True)]
         if not document_ids:
             break
             # Remove the documents for the given ids from the Index.
-        doc_index.remove(document_ids)
+        doc_index.delete(document_ids)
+
+def remove_from_index(doc_id, index_name='users'):
+    doc_index = search.Index(name=index_name)
+    try:
+        doc_index.delete(doc_id)
+    except search.DeleteError:
+        return False
+    return True