[elasticsearch] Fix rangeQuery in elasticsearchclient

elasticsearch/pom.xml

@@ -33,6 +33,8 @@ LICENSE file.
     </properties>
     <dependencies>
         <dependency>
+        <!-- jna is supported in ES and will be used when provided 
+             otherwise a fallback is used -->    
             <groupId>net.java.dev.jna</groupId>
             <artifactId>jna</artifactId>
             <version>4.1.0</version>

elasticsearch/src/main/java/com/yahoo/ycsb/db/ElasticSearchClient.java

@@ -20,7 +20,6 @@ package com.yahoo.ycsb.db;
 import static org.elasticsearch.common.settings.Settings.Builder;
 import static org.elasticsearch.common.xcontent.XContentFactory.jsonBuilder;
 import static org.elasticsearch.index.query.QueryBuilders.rangeQuery;
-import static org.elasticsearch.index.query.QueryBuilders.matchAllQuery;
 import static org.elasticsearch.node.NodeBuilder.nodeBuilder;
 
 
@@ -333,10 +332,10 @@ public class ElasticSearchClient extends DB {
   public Status scan(String table, String startkey, int recordcount,
       Set<String> fields, Vector<HashMap<String, ByteIterator>> result) {
     try {
-      final RangeQueryBuilder filter = rangeQuery("_id").gte(startkey);
+      final RangeQueryBuilder rangeQuery = rangeQuery("_id").gte(startkey);
       final SearchResponse response = client.prepareSearch(indexKey)
           .setTypes(table)
-          .setQuery(matchAllQuery())
+          .setQuery(rangeQuery)
           .setSize(recordcount)
           .execute()
           .actionGet();