[Backport 8.15] Added/updated snippets for docs (#2319)

(cherry picked from commit f737290d10)

Co-authored-by: Josh Mock <joshua.mock@elastic.co>

docs/doc_examples/03582fc93683e573062bcfda45e01d69.asciidoc

@@ -0,0 +1,29 @@
+// 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-index-000001",
+  settings: {
+    analysis: {
+      analyzer: {
+        my_custom_analyzer: {
+          type: "custom",
+          tokenizer: "standard",
+          char_filter: ["html_strip"],
+          filter: ["lowercase", "asciifolding"],
+        },
+      },
+    },
+  },
+});
+console.log(response);
+
+const response1 = await client.indices.analyze({
+  index: "my-index-000001",
+  analyzer: "my_custom_analyzer",
+  text: "Is this déjà vu</b>?",
+});
+console.log(response1);
+----