[RaphaelFakhri]

Problem

RestClientOptions.of() and Rest5ClientOptions.of() convert any other TransportOptions implementation by starting from RequestOptions.DEFAULT. The converted options therefore use the plain response consumer factory instead of SafeResponseConsumer.DEFAULT_FACTORY, which initialOptions() uses to keep errors thrown while consuming a response from shutting down the I/O reactor.

This conversion runs on the default setup path. The ElasticsearchClient.of(...) builder methods transportOptions(fn) and retryConfig(...) produce DefaultTransportOptions, which the transport then converts:

ElasticsearchClient client = ElasticsearchClient.of(b -> b
    .host("https://localhost:9200")
    .apiKey(apiKey)
    .retryConfig(r -> r.maxRetries(3)) // or .transportOptions(o -> o.addHeader(...))
);
// client._transportOptions() no longer uses SafeResponseConsumer

The same happens with client.withTransportOptions(DefaultTransportOptions) or a custom TransportOptions. With either transport, an Error such as OutOfMemoryError raised while reading a response can then stop the I/O reactor and leave the client permanently unusable, the failure mode that SafeResponseConsumer was added to prevent (#1046, #1049).

Change

• Start the conversion from SafeResponseConsumer.DEFAULT_REQUEST_OPTIONS in both RestClientOptions.of() and Rest5ClientOptions.of(), matching initialOptions().
• Add a test to RestClientOptionsTest and Rest5ClientOptionsTest that builds a client with transportOptions(...) and checks that the resulting options use SafeResponseConsumer.DEFAULT_FACTORY.

Testing

./gradlew :java-client:test --tests co.elastic.clients.transport.rest_client.RestClientOptionsTest \
  --tests co.elastic.clients.transport.rest5_client.Rest5ClientOptionsTest

• Without the fix: the 2 new tests fail (12 tests, 2 failed).
• With the fix: all tests pass, together with SafeResponseConsumerTest (both transports) and ElasticsearchTransportConfigTest.
• checkstyleMain, checkstyleTest, forbiddenApisMain and forbiddenApisTest pass.

Fixes #1354