--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dev/doc_agg_date.txt	Wed Nov 09 23:41:15 2016 +0100
@@ -0,0 +1,29 @@
+{
+    "size": 0,
+    "query": { "match_all": [] },
+    "aggs": {
+        "datestats": {
+            "nested": {
+                "path": "creation_years"
+            },
+            "aggs": {
+                "years": {
+                    "terms": {
+                        "field": "creation_years.year",
+                        "size": 0,
+                        "order": {
+                            "_term": "asc"
+                        }
+                    },
+                    "aggs": {
+                        "year_count": {
+                            "sum": {
+                                "field": "creation_years.weight"
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+}