Use OkHttpClient by default and remove the others

Author: alallema

src/main/java/com/meilisearch/sdk/IndexesHandler.java

@@ -14,7 +14,7 @@ class IndexesHandler {
      * @param config Meilisearch configuration
      */
     IndexesHandler(Config config) {
-        this.meilisearchHttpRequest = new MeilisearchHttpRequest(config);
+        this.meilisearchHttpRequest = config.meilisearchHttpRequest;
     }
 
     /**

src/main/java/com/meilisearch/sdk/MeilisearchHttpRequest.java

@@ -4,9 +4,7 @@
 import com.meilisearch.sdk.exceptions.MeilisearchApiException;
 import com.meilisearch.sdk.exceptions.MeilisearchException;
 import com.meilisearch.sdk.http.AbstractHttpClient;
-import com.meilisearch.sdk.http.DefaultHttpClient;
-import com.meilisearch.sdk.http.factory.BasicRequestFactory;
-import com.meilisearch.sdk.http.factory.RequestFactory;
+import com.meilisearch.sdk.http.CustomOkHttpClient;
 import com.meilisearch.sdk.http.request.HttpMethod;
 import com.meilisearch.sdk.http.response.HttpResponse;
 import com.meilisearch.sdk.json.GsonJsonHandler;
@@ -25,7 +23,7 @@ public class MeilisearchHttpRequest {
      * @param config Meilisearch configuration
      */
     public MeilisearchHttpRequest(Config config) {
-        this.client = new DefaultHttpClient(config);
+        this.client = new CustomOkHttpClient(config);
         this.jsonHandler = config.jsonHandler;
         this.factory = new BasicRequestFactory(jsonHandler);
     }