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+[[index_]]
+== Index API
+
+The index API is very similar to the
+link:{java}/index_.html[Java index API]. The Groovy
+extension to it is the ability to provide the indexed source using a
+closure. For example:
+
+[source,js]
+--------------------------------------------------
+def indexR = client.index {
+    index "test"
+    type "type1"
+    id "1"
+    source {
+        test = "value"
+        complex {
+            value1 = "value1"
+            value2 = "value2"
+        }
+    }
+}
+--------------------------------------------------
+
+In the above example, the source closure itself gets transformed into an
+XContent (defaults to JSON). In order to change how the source closure
+is serialized, a global (static) setting can be set on the `GClient` by
+changing the `indexContentType` field.
+
+Note also that the `source` can be set using the typical Java based
+APIs, the `Closure` option is a Groovy extension.