Remove unused importer

Author: guanquan.wang

src/main/java/com/bellszhu/elasticsearch/plugin/synonym/analysis/RemoteSynonymFile.java

@@ -3,20 +3,13 @@
  */
 package com.bellszhu.elasticsearch.plugin.synonym.analysis;
 
-import org.apache.http.Header;
-import org.apache.http.HeaderElement;
-import org.apache.http.HeaderIterator;
-import org.apache.http.HttpEntity;
-import org.apache.http.ProtocolVersion;
-import org.apache.http.StatusLine;
 import org.apache.http.client.config.RequestConfig;
 import org.apache.http.client.methods.CloseableHttpResponse;
 import org.apache.http.client.methods.HttpGet;
 import org.apache.http.client.methods.HttpHead;
 import org.apache.http.client.methods.HttpUriRequest;
 import org.apache.http.impl.client.CloseableHttpClient;
 import org.apache.http.impl.client.HttpClients;
-import org.apache.http.params.HttpParams;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.apache.lucene.analysis.Analyzer;
@@ -33,7 +26,6 @@
 import java.security.AccessController;
 import java.security.PrivilegedAction;
 import java.text.ParseException;
-import java.util.Locale;
 
 /**
  * @author bellszhu