Added/updated snippets for docs (#2318)

docs/doc_examples/be5fef0640c3a650ee96f84e3376a1be.asciidoc

@@ -0,0 +1,20 @@
+// 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.update({
+  index: "test",
+  id: 1,
+  scripted_upsert: true,
+  script: {
+    source:
+      "\n      if ( ctx.op == 'create' ) {\n        ctx._source.counter = params.count\n      } else {\n        ctx._source.counter += params.count\n      }\n    ",
+    params: {
+      count: 4,
+    },
+  },
+  upsert: {},
+});
+console.log(response);
+----