Rename test class to comply with convention

server/src/test/java/org/elasticsearch/index/mapper/MapperBuilderContextTest.java → server/src/test/java/org/elasticsearch/index/mapper/MapperBuilderContextTests.java

@@ -10,7 +10,7 @@
 
 import org.elasticsearch.test.ESTestCase;
 
-public class MapperBuilderContextTest extends ESTestCase {
+public class MapperBuilderContextTests extends ESTestCase {
 
     public void testRoot() {
         MapperBuilderContext root = MapperBuilderContext.root(false, false);