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+[[mapping-source-field]]
+=== `_source`
+
+The `_source` field is an automatically generated field that stores the
+actual JSON that was used as the indexed document. It is not indexed
+(searchable), just stored. When executing "fetch" requests, like
+<<docs-get,get>> or
+<<search-search,search>>, the `_source` field is
+returned by default.
+
+Though very handy to have around, the source field does incur storage
+overhead within the index. For this reason, it can be disabled. For
+example:
+
+[source,js]
+--------------------------------------------------
+{
+    "tweet" : {
+        "_source" : {"enabled" : false}
+    }
+}
+--------------------------------------------------
+
+[float]
+[[include-exclude]]
+==== Includes / Excludes
+
+Allow to specify paths in the source that would be included / excluded
+when it's stored, supporting `*` as wildcard annotation. For example:
+
+[source,js]
+--------------------------------------------------
+{
+    "my_type" : {
+        "_source" : {
+            "includes" : ["path1.*", "path2.*"],
+            "excludes" : ["pat3.*"]
+        }
+    }
+}
+--------------------------------------------------