add reindexing

common/docs/elasticsearch-rest.txt

 #create index with mapping
 curl -XPUT "http://localhost:9200/activityidx" -d'{  "mappings": { "activity": { "properties": { "metaData.loc": { "type": "geo_point"  } } } } }'
+- https://www.elastic.co/blog/changing-mapping-with-zero-downtime
+Steps to change mapping type by reindexing and alias on a new index (using the kibana tools):
+1 - get the mapping of the original index: GET activityidx/_mapping
+2 - create a json file with the changed mapping
+3 - curl -XPUT localhost:9200/activityidx_v1 -H 'Content-Type: application/json' -d @index-mapping (using curl)
+4 reindex to the new original to the new one:
+POST _reindex
+{
+  "conflicts": "proceed",
+  "source": {
+    "index": "activityidx"
+  },
+  "dest": {
+    "index": "activityidx_v1"
+  }
+}
+5 - delete the original: DELETE activityidx
+6 - make an alias of activityidx to the new one: 
+POST _aliases
+{
+    "actions": [
+        { "add": {
+            "alias": "activityidx",
+            "index": "activityidx_v1"
+        }}
+    ]
+}
+
 
 # delete kibana settings
 curl -XDELETE http://localhost:9200/.kibana
@@ -18,7 +46,7 @@ curl -XPOST 'http://172.16.1.72:9200/activityidx/activity/_search' -d '{
 }'
 
 # delete by query
-curl -XPOST 'http://172.16.1.72:9200/activityidx/activity/_delete_by_query' -d '{
+curl -XPOST 'http://172.16.1.72:9200/activityidx/activity/_delete_by_query?conflicts=proceed' -d '{
  "query": {
   "range": {
    "published": {