Added/updated snippets for docs (#2318)

docs/doc_examples/5f8fb5513d4f725434db2f517ad4298f.asciidoc

@@ -0,0 +1,34 @@
+// 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: "index",
+  settings: {
+    number_of_shards: 1,
+    similarity: {
+      scripted_tfidf: {
+        type: "scripted",
+        weight_script: {
+          source:
+            "double idf = Math.log((field.docCount+1.0)/(term.docFreq+1.0)) + 1.0; return query.boost * idf;",
+        },
+        script: {
+          source:
+            "double tf = Math.sqrt(doc.freq); double norm = 1/Math.sqrt(doc.length); return weight * tf * norm;",
+        },
+      },
+    },
+  },
+  mappings: {
+    properties: {
+      field: {
+        type: "text",
+        similarity: "scripted_tfidf",
+      },
+    },
+  },
+});
+console.log(response);
+----