Added/updated snippets for docs (#2318)

docs/doc_examples/f49ac80f0130cae8d0ea6f4472a149dd.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.indices.create({
+  index: "my-image-index",
+  mappings: {
+    properties: {
+      "image-vector": {
+        type: "dense_vector",
+        dims: 3,
+        index: true,
+        similarity: "l2_norm",
+      },
+      "file-type": {
+        type: "keyword",
+      },
+      title: {
+        type: "text",
+      },
+    },
+  },
+});
+console.log(response);
+----