diff --git a/invenio_users_resources/records/hooks.py b/invenio_users_resources/records/hooks.py
index bcfd20a..f162f6e 100644
--- a/invenio_users_resources/records/hooks.py
+++ b/invenio_users_resources/records/hooks.py
@@ -12,8 +12,9 @@
 from invenio_accounts.models import Role, User
 from invenio_accounts.proxies import current_db_change_history
 
-from ..services.groups.tasks import reindex_group, unindex_group
-from ..services.users.tasks import reindex_user, unindex_user
+from ..proxies import current_groups_service, current_users_service
+from ..services.groups.tasks import reindex_groups, unindex_groups
+from ..services.users.tasks import reindex_users, unindex_users
 
 
 def pre_commit(sender, session):
@@ -50,15 +51,18 @@ def post_commit(sender, session):
     # DB operations are allowed here, not even lazy-loading of
     # properties!
     sid = id(session)
+
     if current_db_change_history.sessions.get(sid):
-        for user_id in current_db_change_history.sessions[sid].updated_users:
-            reindex_user.delay(user_id)
+        # Handle updates
+        current_session = list(current_db_change_history.sessions[sid].updated_users)
+        current_users_service.indexer.bulk_index(current_session)
 
-        for role_id in current_db_change_history.sessions[sid].updated_roles:
-            reindex_group.delay(role_id)
+        role_ids_updated = list(current_db_change_history.sessions[sid].updated_roles)
+        current_groups_service.indexer.bulk_index(role_ids_updated)
 
-        for user_id in current_db_change_history.sessions[sid].deleted_users:
-            unindex_user.delay(user_id)
+        # Handle deletes
+        user_ids_deleted = list(current_db_change_history.sessions[sid].deleted_users)
+        current_users_service.indexer.bulk_delete(user_ids_deleted)
 
-        for role_id in current_db_change_history.sessions[sid].deleted_roles:
-            unindex_group.delay(role_id)
+        role_ids_deleted = list(current_db_change_history.sessions[sid].deleted_roles)
+        current_groups_service.indexer.bulk_delete(role_ids_deleted)
diff --git a/invenio_users_resources/services/groups/tasks.py b/invenio_users_resources/services/groups/tasks.py
index 78b379b..797d797 100644
--- a/invenio_users_resources/services/groups/tasks.py
+++ b/invenio_users_resources/services/groups/tasks.py
@@ -18,24 +18,22 @@
 
 
 @shared_task(ignore_result=True)
-def reindex_group(role_id):
+def reindex_groups(role_ids):
     """Reindex the given user."""
     index = current_groups_service.record_cls.index
     if current_groups_service.indexer.exists(index):
         try:
-            group_agg = GroupAggregate.get_record(role_id)
-            current_groups_service.indexer.index(group_agg)
+            current_groups_service.indexer.bulk_index(role_ids)
         except search.exceptions.ConflictError as e:
-            current_app.logger.warn(f"Could not reindex group {role_id}: {e}")
+            current_app.logger.warn(f"Could not bulk-reindex groups: {e}")
 
 
 @shared_task(ignore_result=True)
-def unindex_group(role_id):
+def unindex_groups(role_ids):
     """Unindex the given role/group."""
     index = current_groups_service.record_cls.index
     if current_groups_service.indexer.exists(index):
         try:
-            group_agg = GroupAggregate.get_record(role_id)
-            current_groups_service.indexer.delete(group_agg)
+            current_groups_service.indexer.bulk_delete(role_ids)
         except search.exceptions.ConflictError as e:
-            current_app.logger.warn(f"Could not unindex group {role_id}: {e}")
+            current_app.logger.warn(f"Could not bulk-unindex groups: {e}")
diff --git a/invenio_users_resources/services/users/tasks.py b/invenio_users_resources/services/users/tasks.py
index a6be922..324911f 100644
--- a/invenio_users_resources/services/users/tasks.py
+++ b/invenio_users_resources/services/users/tasks.py
@@ -19,28 +19,38 @@
 
 
 @shared_task(ignore_result=True)
-def reindex_user(user_id):
+def reindex_users(user_ids):
     """Reindex the given user."""
     index = current_users_service.record_cls.index
     if current_users_service.indexer.exists(index):
         try:
-            user_agg = UserAggregate.get_record(user_id)
-            current_users_service.indexer.index(user_agg)
+            user_agg = {
+                user_id: UserAggregate.get_record(user_id) for user_id in user_ids
+            }
+            current_users_service.indexer.bulk_index(user_ids)
+
             # trigger reindexing of related records
             send_change_notifications(
-                "users", [(user_agg.id, str(user_agg.id), user_agg.revision_id)]
+                "users",
+                [
+                    (
+                        user_agg[user_id].id,
+                        str(user_agg[user_id].id),
+                        user_agg[user_id].revision_id,
+                    )
+                    for user_id in user_ids
+                ],
             )
         except search.exceptions.ConflictError as e:
-            current_app.logger.warn(f"Could not reindex user {user_id}: {e}")
+            current_app.logger.warn(f"Could not bulk-reindex users: {e}")
 
 
 @shared_task(ignore_result=True)
-def unindex_user(user_id):
+def unindex_users(user_ids):
     """Delete the given user from the index."""
     index = current_users_service.record_cls.index
     if current_users_service.indexer.exists(index):
         try:
-            user_agg = UserAggregate.get_record(user_id)
-            current_users_service.indexer.delete(user_agg)
+            current_users_service.indexer.bulk_delete(user_ids)
         except search.exceptions.ConflictError as e:
-            current_app.logger.warn(f"Could not unindex user {user_id}: {e}")
+            current_app.logger.warn(f"Could not bulk-unindex users: {e}")
diff --git a/tests/conftest.py b/tests/conftest.py
index f01eeca..d636efb 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -26,7 +26,7 @@
     current_groups_service,
     current_users_service,
 )
-from invenio_users_resources.records import GroupAggregate, UserAggregate
+from invenio_users_resources.records import GroupAggregate
 from invenio_users_resources.services.schemas import (
     NotificationPreferences,
     UserPreferencesSchema,
@@ -209,7 +209,8 @@ def users(UserFixture, app, database, users_data):
         )
         u.create(app, database)
         users[obj["username"]] = u
-    UserAggregate.index.refresh()
+    current_users_service.indexer.process_bulk_queue()
+    current_users_service.record_cls.index.refresh()
     return users
 
 
@@ -234,7 +235,7 @@ def group(database):
         database=database,
     )
 
-    GroupAggregate.index.refresh()
+    # GroupAggregate.index.refresh()
     return r
 
 
@@ -249,7 +250,7 @@ def group2(database):
         database=database,
     )
 
-    GroupAggregate.index.refresh()
+    # GroupAggregate.index.refresh()
     return r
 
 
@@ -258,7 +259,8 @@ def groups(database, group, group2):
     """A single group."""
     roles = [group, group2]
 
-    GroupAggregate.index.refresh()
+    current_groups_service.indexer.process_bulk_queue()
+    current_groups_service.record_cls.index.refresh()
     return roles