Number of threads

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:

CloseableHttpAsyncClient httpclient = HttpAsyncClients.custom()
    .setIOReactorConfig(
        IOReactorConfig.custom().setIoThreadCount(1).build()
    )
    .build();

Rest5ClientBuilder builder = Rest5Client
    .builder(new HttpHost("localhost", 9200))
    .setHttpClient(httpclient);