Remove redemptionHistoryEntry from LrpToken index

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=134570879

java/google/registry/model/domain/LrpToken.java

@@ -55,7 +55,6 @@ public class LrpToken extends BackupGroupRoot implements Buildable {
    * The key of the history entry for which the token was used. Given LRP is a domain application
    * phase, this should always be a {@link Type#DOMAIN_APPLICATION_CREATE}.
    */
-  @Index
   Key<HistoryEntry> redemptionHistoryEntry;
   
   public String getToken() {

javatests/google/registry/model/domain/LrpTokenTest.java

@@ -86,6 +86,6 @@ public class LrpTokenTest extends EntityTestCase {
 
   @Test
   public void testIndexing() throws Exception {
-    verifyIndexing(redeemedToken, "assignee", "token", "redemptionHistoryEntry");
+    verifyIndexing(redeemedToken, "assignee", "token");
   }
 }