DATAES-130 Added support for Spel Expressions in Type

- Added support for Spel Expressions in index type

- Renamed SpELEntityTest to SpELEntityTests so they run when
called from maven

src/main/java/org/springframework/data/elasticsearch/core/mapping/SimpleElasticsearchPersistentEntity.java

@@ -95,7 +95,8 @@ public class SimpleElasticsearchPersistentEntity<T> extends BasicPersistentEntit
 
 	@Override
 	public String getIndexType() {
-		return indexType;
+		Expression expression = parser.parseExpression(indexType, ParserContext.TEMPLATE_EXPRESSION);
+		return expression.getValue(context, String.class);
 	}
 
 	@Override