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ElasticSearch Java REST client - Apache HTTP Client package
There is a newer version: 6.3.1
package io.searchbox.client.http;

import io.searchbox.action.Action;
import io.searchbox.client.AbstractJestClient;
import io.searchbox.client.JestResult;
import io.searchbox.client.JestResultHandler;
import io.searchbox.client.http.apache.HttpDeleteWithEntity;
import io.searchbox.client.http.apache.HttpGetWithEntity;
import java.io.IOException;
import java.util.Map.Entry;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.entity.EntityBuilder;
import org.apache.http.client.methods.HttpEntityEnclosingRequestBase;
import org.apache.http.client.methods.HttpHead;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.concurrent.FutureCallback;
import org.apache.http.entity.ContentType;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.nio.client.CloseableHttpAsyncClient;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.gson.Gson;

/**
 * @author Dogukan Sonmez
 * @author cihat keser
 */
public class JestHttpClient extends AbstractJestClient {

    private final static Logger log = LoggerFactory.getLogger(JestHttpClient.class);

    protected ContentType requestContentType = ContentType.APPLICATION_JSON.withCharset("utf-8");

    private CloseableHttpClient httpClient;
    private CloseableHttpAsyncClient asyncClient;

    /**
     * @throws IOException in case of a problem or the connection was aborted during request,
     *                     or in case of a problem while reading the response stream
     */
    @Override
    public  T execute(Action clientRequest) throws IOException {
        HttpUriRequest request = prepareRequest(clientRequest);
        HttpResponse response = httpClient.execute(request);

        return deserializeResponse(response, clientRequest);
    }

    @Override
    public  void executeAsync(final Action clientRequest, final JestResultHandler resultHandler) {
        synchronized (this) {
            if (!asyncClient.isRunning()) {
                asyncClient.start();
            }
        }

        HttpUriRequest request = prepareRequest(clientRequest);
        asyncClient.execute(request, new DefaultCallback(clientRequest, resultHandler));
    }

    @Override
    public void shutdownClient() {
        super.shutdownClient();
        try {
            asyncClient.close();
        } catch (IOException ex) {
            log.error("Exception occurred while shutting down the async client.", ex);
        }
        try {
            httpClient.close();
        } catch (IOException ex) {
            log.error("Exception occurred while shutting down the sync client.", ex);
        }
    }

    protected  HttpUriRequest prepareRequest(final Action clientRequest) {
        String elasticSearchRestUrl = getRequestURL(getNextServer(), clientRequest.getURI());
        HttpUriRequest request = constructHttpMethod(clientRequest.getRestMethodName(), elasticSearchRestUrl, clientRequest.getData(gson));

        log.debug("Request method={} url={}", clientRequest.getRestMethodName(), elasticSearchRestUrl);

        // add headers added to action
        for (Entry header : clientRequest.getHeaders().entrySet()) {
            request.addHeader(header.getKey(), header.getValue().toString());
        }

        return request;
    }

    protected HttpUriRequest constructHttpMethod(String methodName, String url, String payload) {
        HttpUriRequest httpUriRequest = null;

        if (methodName.equalsIgnoreCase("POST")) {
            httpUriRequest = new HttpPost(url);
            log.debug("POST method created based on client request");
        } else if (methodName.equalsIgnoreCase("PUT")) {
            httpUriRequest = new HttpPut(url);
            log.debug("PUT method created based on client request");
        } else if (methodName.equalsIgnoreCase("DELETE")) {
            httpUriRequest = new HttpDeleteWithEntity(url);
            log.debug("DELETE method created based on client request");
        } else if (methodName.equalsIgnoreCase("GET")) {
            httpUriRequest = new HttpGetWithEntity(url);
            log.debug("GET method created based on client request");
        } else if (methodName.equalsIgnoreCase("HEAD")) {
            httpUriRequest = new HttpHead(url);
            log.debug("HEAD method created based on client request");
        }

        if (httpUriRequest != null && httpUriRequest instanceof HttpEntityEnclosingRequestBase && payload != null) {
            EntityBuilder entityBuilder = EntityBuilder.create()
                    .setText(payload)
                    .setContentType(requestContentType);

            if (isRequestCompressionEnabled()) {
                entityBuilder.gzipCompress();
            }

            ((HttpEntityEnclosingRequestBase) httpUriRequest).setEntity(entityBuilder.build());
        }

        return httpUriRequest;
    }

    private  T deserializeResponse(HttpResponse response, Action clientRequest) throws IOException {
        StatusLine statusLine = response.getStatusLine();
        return clientRequest.createNewElasticSearchResult(
                response.getEntity() == null ? null : EntityUtils.toString(response.getEntity()),
                statusLine.getStatusCode(),
                statusLine.getReasonPhrase(),
                gson
        );
    }

    public CloseableHttpClient getHttpClient() {
        return httpClient;
    }

    public void setHttpClient(CloseableHttpClient httpClient) {
        this.httpClient = httpClient;
    }

    public CloseableHttpAsyncClient getAsyncClient() {
        return asyncClient;
    }

    public void setAsyncClient(CloseableHttpAsyncClient asyncClient) {
        this.asyncClient = asyncClient;
    }

    public Gson getGson() {
        return gson;
    }

    public void setGson(Gson gson) {
        this.gson = gson;
    }

    protected class DefaultCallback implements FutureCallback {
        private final Action clientRequest;
        private final JestResultHandler resultHandler;

        public DefaultCallback(Action clientRequest, JestResultHandler resultHandler) {
            this.clientRequest = clientRequest;
            this.resultHandler = resultHandler;
        }

        @Override
        public void completed(final HttpResponse response) {
            T jestResult = null;
            try {
                jestResult = deserializeResponse(response, clientRequest);
            } catch (IOException e) {
                failed(e);
            }
            if (jestResult != null) resultHandler.completed(jestResult);
        }

        @Override
        public void failed(final Exception ex) {
            log.error("Exception occurred during async execution.", ex);
            resultHandler.failed(ex);
        }

        @Override
        public void cancelled() {
            log.warn("Async execution was cancelled; this is not expected to occur under normal operation.");
        }
    }

}