allow script engines to have several types

modules/elasticsearch/src/main/java/org/elasticsearch/script/ScriptEngineService.java

@@ -26,7 +26,7 @@ import java.util.Map;
  */
 public interface ScriptEngineService {
 
-    String type();
+    String[] types();
 
     Object compile(String script);
 

modules/elasticsearch/src/main/java/org/elasticsearch/script/ScriptService.java

@@ -57,7 +57,9 @@ public class ScriptService extends AbstractComponent {
 
         ImmutableMap.Builder<String, ScriptEngineService> builder = ImmutableMap.builder();
         for (ScriptEngineService scriptEngine : scriptEngines) {
-            builder.put(scriptEngine.type(), scriptEngine);
+            for (String type : scriptEngine.types()) {
+                builder.put(type, scriptEngine);
+            }
         }
         this.scriptEngines = builder.build();
     }

modules/elasticsearch/src/main/java/org/elasticsearch/script/mvel/MvelScriptEngineService.java

@@ -55,8 +55,8 @@ public class MvelScriptEngineService extends AbstractComponent implements Script
         }
     }
 
-    @Override public String type() {
-        return "mvel";
+    @Override public String[] types() {
+        return new String[]{"mvel"};
     }
 
     @Override public Object compile(String script) {

plugins/lang/groovy/src/main/java/org/elasticsearch/script/groovy/GroovyScriptEngineService.java

@@ -46,8 +46,8 @@ public class GroovyScriptEngineService extends AbstractComponent implements Scri
         this.loader = new GroovyClassLoader(settings.getClassLoader());
     }
 
-    @Override public String type() {
-        return "groovy";
+    @Override public String[] types() {
+        return new String[]{"groovy"};
     }
 
     @Override public Object compile(String script) {