The ReactiveElasticsearchClient is a non official driver based on WebClient. It uses the request/response objects provided by the Elasticsearch core project. Calls are directly operated on the reactive stack, not wrapping async (thread pool bound) responses into reactive types.

class ApplicationConfiguration extends AbstractReactiveElasticsearchConfiguration {

    @Bean
    @Override
    public ReactiveElasticsearchClient reactiveElasticsearchClient() {
        return ReactiveRestClients.create(ClientConfiguration.localhost());
    }
}

The ReactiveElasticsearchClient can be used with the ReactiveElasticsearchOperations and ReactiveElasticsearchRepository.

@Autowired ReactiveElasticsearchOperations operations;

// ...

CriteriaQuery query = new CriteriaQuery("keywords").contains("java");

Flux<Conference> result = operations.find(query, Conference.class);

interface ConferenceRepository extends ReactiveCrudRepository<Conference, String> {
 
    Flux<Conference> findAllByKeywordsContains(String keyword);
}

// ...

@Autowired ConferenceRepository repository;

// ...

Flux<Conference> result = repository.findAllByKeywordsContains("java");

Requirements:

Running Elasticsearch

$ cd elasticsearch
$ ./bin/elasticsearch