Don't fail on unknown IOContexts - TODO: Move the default buffer size into the Context enum as getter?

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1379459 13f79535-47bb-0310-9956-ffa450edef68

lucene/core/src/java/org/apache/lucene/store/BufferedIndexInput.java

@@ -355,14 +355,10 @@ public abstract class BufferedIndexInput extends IndexInput {
    */
   public static int bufferSize(IOContext context) {
     switch (context.context) {
-    case DEFAULT:
-    case FLUSH:
-    case READ:
-      return BUFFER_SIZE;
     case MERGE:
       return MERGE_BUFFER_SIZE;
     default:
-      throw new AssertionError("unknown IOContext " + context.context);
+      return BUFFER_SIZE;
     }
   }