Added/updated snippets for docs (#2318)

docs/doc_examples/60a9aa5dcde9023901f6ff27231a10c4.asciidoc

@@ -0,0 +1,27 @@
+// 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: "news",
+  query: {
+    match: {
+      content: "madrid",
+    },
+  },
+  aggs: {
+    tags: {
+      significant_text: {
+        field: "content",
+        background_filter: {
+          term: {
+            content: "spain",
+          },
+        },
+      },
+    },
+  },
+});
+console.log(response);
+----