Key settings must be an object – How to solve this Elasticsearch error

Log Context

Log “key [settings] must be an object”classname  is CreateIndexRequest.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

public CreateIndexRequest source(Map source; DeprecationHandler deprecationHandler) {
 for (Map.Entry entry : source.entrySet()) {
 String name = entry.getKey();
 if (SETTINGS.match(name; deprecationHandler)) {
 if (entry.getValue() instanceof Map == false) {
 throw new ElasticsearchParseException("key [settings] must be an object");
 }
 settings((Map) entry.getValue());
 } else if (MAPPINGS.match(name; deprecationHandler)) {
 Map mappings = (Map) entry.getValue();
 for (Map.Entry entry1 : mappings.entrySet()) {