Enable permission aware ref database per default

Change-Id: I74659871d2095d438d573a96070d1e9a692ba0c9

Documentation/config-gerrit.txt

diff --git a/Documentation/config-gerrit.txt b/Documentation/config-gerrit.txt
index c0605a0..39ad1ca 100644
--- a/Documentation/config-gerrit.txt
+++ b/Documentation/config-gerrit.txt
@@ -3865,13 +3865,11 @@
 `ADVERTISE_REF_HOOK` relies on the fact that advertise refs filter is called
 by the JGit layer, `PERMISSION_AWARE_REF_DATABASE` backend replaces ref
 database with a permission-aware implementation. This database will only
-ever return refs that the user has access to. For backwards compatibility
-`ADVERTISE_REF_HOOK` is the default backend.
+ever return refs that the user has access to.
 +
-In future gerrit releases, the default will be switched, the old backend
-will be deprecated and removed.
+In future gerrit releases, the old backend will be deprecated and removed.
 +
-By default, `ADVERTISE_REF_HOOK`.
+By default, `PERMISSION_AWARE_REF_DATABASE`.
 
 [[receive.enableProtocolV2]]receive.enableProtocolV2::
 +

java/com/google/gerrit/server/git/TransferConfig.java

diff --git a/java/com/google/gerrit/server/git/TransferConfig.java b/java/com/google/gerrit/server/git/TransferConfig.java
index 6091195..f1dcc72 100644
--- a/java/com/google/gerrit/server/git/TransferConfig.java
+++ b/java/com/google/gerrit/server/git/TransferConfig.java
@@ -49,7 +49,10 @@
         cfg.getBoolean("receive", "inheritProjectMaxObjectSizeLimit", false);
     refPermissionBackend =
         cfg.getEnum(
-            "receive", null, "refPermissionBackend", RefPermissionBackend.ADVERTISE_REF_HOOK);
+            "receive",
+            null,
+            "refPermissionBackend",
+            RefPermissionBackend.PERMISSION_AWARE_REF_DATABASE);
     enableProtocolV2 = cfg.getBoolean("receive", "enableProtocolV2", false);
 
     packConfig = new PackConfig();

javatests/com/google/gerrit/acceptance/git/RefAdvertisementIT.java

diff --git a/javatests/com/google/gerrit/acceptance/git/RefAdvertisementIT.java b/javatests/com/google/gerrit/acceptance/git/RefAdvertisementIT.java
index 65cdc55..76ef95b 100644
--- a/javatests/com/google/gerrit/acceptance/git/RefAdvertisementIT.java
+++ b/javatests/com/google/gerrit/acceptance/git/RefAdvertisementIT.java
@@ -122,13 +122,10 @@
   }
 
   @ConfigSuite.Config
-  public static Config enableRefPermissionBackend() {
+  public static Config enableAdvertiseRefsHook() {
     Config cfg = new Config();
     cfg.setString(
-        "receive",
-        null,
-        "refPermissionBackend",
-        RefPermissionBackend.PERMISSION_AWARE_REF_DATABASE.name());
+        "receive", null, "refPermissionBackend", RefPermissionBackend.ADVERTISE_REF_HOOK.name());
     return cfg;
   }