Added/updated snippets for docs (#2318)

docs/doc_examples/ef779b87b3b0fb6e6bae9c8875e3a1cf.asciidoc

@@ -0,0 +1,26 @@
+// 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: {
+    "date.promoted_is_tomorrow": {
+      type: "date",
+      script:
+        "\n        long date = doc['date'].value.toInstant().toEpochMilli();\n        if (doc['promoted'].value) {\n          date += 86400;\n        }\n        emit(date);\n      ",
+    },
+  },
+  aggs: {
+    sales_over_time: {
+      date_histogram: {
+        field: "date.promoted_is_tomorrow",
+        calendar_interval: "1M",
+      },
+    },
+  },
+});
+console.log(response);
+----