fixes imports

Author: otaviojava

elasticsearch-driver/src/main/java/org/jnosql/diana/elasticsearch/document/ElasticsearchDocumentConfiguration.java

@@ -16,7 +16,6 @@
 
 
 import org.apache.http.Header;
-import org.apache.http.HttpHeaders;
 import org.apache.http.HttpHost;
 import org.elasticsearch.client.RestClient;
 import org.elasticsearch.client.RestClientBuilder;