Added doc examples (#1011)

* Added generate-docs-examples script

* Added doc_examples folder wth the initial examples

docs/doc_examples/231aa0bb39c35fe199d28fe0e4a62b2e.asciidoc

@@ -0,0 +1,18 @@
+// 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: 'bank',
+  body: {
+    query: {
+      match_phrase: {
+        address: 'mill lane'
+      }
+    }
+  }
+})
+console.log(response)
+----
+