Added/updated snippets for docs (#2318)

docs/doc_examples/d13c7cdfc976e0c7b70737cd6a7becb8.asciidoc

@@ -0,0 +1,37 @@
+// This file is autogenerated, DO NOT EDIT
+// Use `node scripts/generate-docs-examples.js` to generate the docs examples
+
+[source, js]
+----
+const response = await client.search({
+  index: "sales",
+  size: 0,
+  runtime_mappings: {
+    "price.adjusted": {
+      type: "double",
+      script: {
+        source: "emit(doc['price'].value * params.adjustment)",
+        params: {
+          adjustment: 0.9,
+        },
+      },
+    },
+  },
+  aggs: {
+    by_date: {
+      date_histogram: {
+        field: "date",
+        calendar_interval: "month",
+      },
+      aggs: {
+        avg_price: {
+          rate: {
+            field: "price.adjusted",
+          },
+        },
+      },
+    },
+  },
+});
+console.log(response);
+----