contracts-bedrock: make event indexed

packages/contracts-bedrock/.gas-snapshot

@@ -29,7 +29,7 @@ DeployerWhitelist_Test:test_owner_succeeds() (gas: 7582)
 DeployerWhitelist_Test:test_storageSlots_succeeds() (gas: 33395)
 DisputeGameFactory_Test:test_owner_succeeds() (gas: 7582)
 DisputeGameFactory_Test:test_setImplementation_notOwner_reverts() (gas: 11191)
-DisputeGameFactory_Test:test_setImplementation_succeeds() (gas: 38528)
+DisputeGameFactory_Test:test_setImplementation_succeeds() (gas: 38765)
 DisputeGameFactory_Test:test_transferOwnership_notOwner_reverts() (gas: 10979)
 DisputeGameFactory_Test:test_transferOwnership_succeeds() (gas: 13180)
 FeeVault_Test:test_constructor_succeeds() (gas: 10736)

packages/contracts-bedrock/contracts/dispute/IDisputeGameFactory.sol

@@ -25,10 +25,10 @@ interface IDisputeGameFactory {
 
     /**
      * @notice Emitted when a new game implementation added to the factory
-     * @param gameType The type of the DisputeGame.
      * @param impl The implementation contract for the given `GameType`.
+     * @param gameType The type of the DisputeGame.
      */
-    event ImplementationSet(address impl, GameType gameType);
+    event ImplementationSet(address indexed impl, GameType indexed gameType);
 
     /**
      * @notice `games` queries an internal a mapping that maps the hash of

packages/contracts-bedrock/contracts/test/DisputeGameFactory.t.sol

@@ -18,7 +18,7 @@ contract DisputeGameFactory_Test is Test {
         Claim indexed rootClaim
     );
 
-    event ImplementationSet(address impl, GameType gameType);
+    event ImplementationSet(address indexed impl, GameType indexed gameType);
 
     function setUp() public {
         factory = new DisputeGameFactory(address(this));