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Number of threadsedit
The Apache Http Async Client starts by default one dispatcher thread, and a
number of worker threads used by the connection manager, as many as the number
of locally detected processors (depending on what
Runtime.getRuntime().availableProcessors() returns). The number of threads
can be modified as follows:
RestClient restClient = RestClient.builder(new HttpHost("localhost", 9200))
.setHttpClientConfigCallback(new RestClientBuilder.HttpClientConfigCallback() {
@Override
public HttpAsyncClientBuilder customizeHttpClient(HttpAsyncClientBuilder httpClientBuilder) {
return httpClientBuilder.setDefaultIOReactorConfig(
IOReactorConfig.custom().setIoThreadCount(1).build());
}
})
.build();