Added/updated snippets for docs (#2318)

docs/doc_examples/850bfd0a00d32475a54ac7f87fb4cc4d.asciidoc

@@ -0,0 +1,25 @@
+// 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: "my-index-000001",
+  runtime_mappings: {
+    "measures.voltage": {
+      type: "double",
+      script: {
+        source:
+          "if (doc['model_number.keyword'].value.equals('HG537PU'))\n        {emit(1.7 * params._source['measures']['voltage']);}\n        else{emit(params._source['measures']['voltage']);}",
+      },
+    },
+  },
+  query: {
+    match: {
+      model_number: "HG537PU",
+    },
+  },
+  fields: ["measures.voltage"],
+});
+console.log(response);
+----