In java client v.2.11.1 how to tell the client wich field shoud be return in a query?

OpenSearch
1

2.11.1" (relevant - OpenSearch/Dashboard/Server OS/Browser):
OpenSearchTransport transport = new RestClientTransport(restClient, new JacksonJsonpMapper());
client = new OpenSearchClient(transport);
String index = “buscador-sentencia-idx”;

String query = “"Text to be search"”;

SearchRequest.Builder requestBuilder = new SearchRequest.Builder();
requestBuilder.index(index);

// Section with fields to be return after query from OpenSearch.
SourceConfig.Builder sb = new SourceConfig.Builder();
SourceConfig sourceConfig = SourceConfig.Builder().includes(Arrays.asList(“field1”, “field2”, “field3”)).build();
requestBuilder.source(sourceConfig);

Describe the issue:

Configuration:

Relevant Logs or Screenshots: