Update index-operations.asciidoc (#537)

Typo in method parameter

Author: paveljanda

docs/index-operations.asciidoc

@@ -17,7 +17,7 @@ $params = [
 ];
 
 // Create the index
-$response = $client->indices()->create($indexParams);
+$response = $client->indices()->create($params);
 ----
 {zwsp} +