Add couch_index_plugin:index_update/4
diff --git a/src/couch_index_plugin.erl b/src/couch_index_plugin.erl
new file mode 100644
index 0000000..1e10c61
--- /dev/null
+++ b/src/couch_index_plugin.erl
@@ -0,0 +1,28 @@
+% Licensed under the Apache License, Version 2.0 (the "License"); you may not
+% use this file except in compliance with the License. You may obtain a copy of
+% the License at
+%
+%   http://www.apache.org/licenses/LICENSE-2.0
+%
+% Unless required by applicable law or agreed to in writing, software
+% distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+% WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+% License for the specific language governing permissions and limitations under
+% the License.
+
+-module(couch_index_plugin).
+
+-export([index_update/4]).
+
+-include_lib("couch/include/couch_db.hrl").
+
+-define(SERVICE_ID, couch_index).
+
+%% ------------------------------------------------------------------
+%% API Function Definitions
+%% ------------------------------------------------------------------
+
+index_update(State, View, Updated, Removed) ->
+    Handle = couch_epi:get_handle(?SERVICE_ID),
+    Args = [State, View, Updated, Removed],
+    couch_epi:apply(Handle, ?SERVICE_ID, index_update, Args, [ignore_providers]).