Added more setters in Rest5Builder (#1019)

* added more configs in rest5builder

* cleanup

Author: l-trotta

java-client/src/main/java/co/elastic/clients/transport/rest5_client/low_level/Rest5ClientBuilder.java

@@ -27,14 +27,17 @@
 import org.apache.hc.client5.http.impl.async.HttpAsyncClientBuilder;
 import org.apache.hc.client5.http.impl.nio.PoolingAsyncClientConnectionManager;
 import org.apache.hc.client5.http.impl.nio.PoolingAsyncClientConnectionManagerBuilder;
+import org.apache.hc.client5.http.routing.HttpRoutePlanner;
 import org.apache.hc.core5.http.Header;
+import org.apache.hc.core5.http.HttpHost;
 import org.apache.hc.core5.http.nio.ssl.BasicClientTlsStrategy;
 import org.apache.hc.core5.util.Timeout;
 import org.apache.hc.core5.util.VersionInfo;
 
 import javax.net.ssl.SSLContext;
 import java.io.IOException;
 import java.io.InputStream;
+import java.net.ProxySelector;
 import java.security.NoSuchAlgorithmException;
 import java.util.List;
 import java.util.Locale;
@@ -75,6 +78,9 @@ public final class Rest5ClientBuilder {
     private Header[] defaultHeaders = EMPTY_HEADERS;
     private Rest5Client.FailureListener failureListener;
     private SSLContext sslContext;
+    private HttpHost proxy;
+    private ProxySelector proxySelector;
+    private HttpRoutePlanner routePlanner;
     private String pathPrefix;
     private NodeSelector nodeSelector = NodeSelector.ANY;
     private boolean strictDeprecationMode = false;
@@ -180,6 +186,24 @@ public Rest5ClientBuilder setSSLContext(SSLContext sslContext) {
         return this;
     }
 
+    public Rest5ClientBuilder setProxy(HttpHost proxy) {
+        Objects.requireNonNull(proxy, "proxy must not be null");
+        this.proxy = proxy;
+        return this;
+    }
+
+    public Rest5ClientBuilder setProxySelector(ProxySelector proxySelector) {
+        Objects.requireNonNull(proxySelector, "proxy selector must not be null");
+        this.proxySelector = proxySelector;
+        return this;
+    }
+
+    public Rest5ClientBuilder setRoutePlanner(HttpRoutePlanner routePlanner) {
+        Objects.requireNonNull(routePlanner, "route planner must not be null");
+        this.routePlanner = routePlanner;
+        return this;
+    }
+
     /**
      * Sets the default request headers, which will be sent along with each request.
      * <p>
@@ -374,6 +398,16 @@ private CloseableHttpAsyncClient createHttpClient() {
                 .setTargetAuthenticationStrategy(new DefaultAuthenticationStrategy())
                 .setThreadFactory(new RestClientThreadFactory());
 
+            if (this.proxy != null) {
+                httpClientBuilder.setProxy(this.proxy);
+            }
+            if (this.proxySelector != null) {
+                httpClientBuilder.setProxySelector(this.proxySelector);
+            }
+            if (this.routePlanner != null) {
+                httpClientBuilder.setRoutePlanner(this.routePlanner);
+            }
+
             return httpClientBuilder.build();
         } catch (NoSuchAlgorithmException e) {
             throw new IllegalStateException("could not create the default ssl context", e);