[hooks] create index on hooks if it doesn't exist

hooks.py

@@ -49,6 +49,12 @@
         locations = self._cw.vreg.config['elasticsearch-locations']
         index_name = self._cw.vreg.config['index-name']
         if locations and index_name:
+            es = Elasticsearch(locations and locations.split(','))
+            # TODO : have a cache so that we don't check index on every transition
+            if not es.indices.exists(index=index_name):
+                es.indices.create(index=index_name,
+                                  body=INDEX_SETTINGS,
+                                  ignore=400)
             # serializer = self.entity.cw_adapt_to('IFTISerializable')
             serializer = self.entity.cw_adapt_to('ISerializable')
             json = serializer.serialize()
@@ -52,7 +58,6 @@
             # serializer = self.entity.cw_adapt_to('IFTISerializable')
             serializer = self.entity.cw_adapt_to('ISerializable')
             json = serializer.serialize()
-            es = Elasticsearch(locations and locations.split(','))
             try:
                 # TODO option pour coté async ?
                 es.index(index=index_name,