Add CLI command for reindexing entites in the search engine

* because the 'rdm-records rebuild-index' command doesn't rebuild
  indices for all available/required services (at the moment)

invenio_utilities_tuw/cli/cli.py

 # -*- coding: utf-8 -*-
 #
-# Copyright (C) 2020 - 2021 TU Wien.
+# Copyright (C) 2020 - 2022 TU Wien.
 #
 # Invenio-Utilities-TUW is free software; you can redistribute it and/or
 # modify it under the terms of the MIT License; see LICENSE file for more
@@ -13,6 +13,7 @@ import click
 from .drafts import drafts
 from .files import files
 from .records import records
+from .search import search
 from .users import users
 
 
@@ -24,4 +25,5 @@ def utilities():
 utilities.add_command(drafts)
 utilities.add_command(files)
 utilities.add_command(records)
+utilities.add_command(search)
 utilities.add_command(users)

invenio_utilities_tuw/cli/search.py

+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2020 - 2022 TU Wien.
+#
+# Invenio-Utilities-TUW is free software; you can redistribute it and/or
+# modify it under the terms of the MIT License; see LICENSE file for more
+# details.
+
+"""Management commands for search indices."""
+
+import click
+from flask import current_app
+from flask.cli import with_appcontext
+from invenio_access.permissions import system_identity
+from invenio_communities.proxies import current_communities
+from invenio_rdm_records.proxies import current_rdm_records
+from invenio_requests.proxies import current_events_service, current_requests_service
+from invenio_users_resources.proxies import (
+    current_groups_service,
+    current_users_service,
+)
+
+
+@click.group()
+def search():
+    """Management commands for search indices."""
+
+
+@search.command("reindex")
+@with_appcontext
+def reindex_everything():
+    """Use all known services to reindex their objects in the search engine.
+
+    (Re-)index all relevant entities for the currently known services.
+    Note that this only performs indexing operations, and no indices are cleared
+    or torn down and recreated beforehand.
+
+    Current state (regarding known services): App-RDM v9.1.3
+    """
+    # TODO maybe we could use the 'invenio_records_resources.proxies.service_registry'
+
+    # rebuilding records and drafts
+    click.echo("indexing records and drafts... ", nl=False)
+    current_rdm_records.records_service.rebuild_index(system_identity)
+    click.echo("done.")
+
+    # rebuilding communities and community members
+    click.echo("indexing communities and community members... ", nl=False)
+    current_communities.service.rebuild_index(system_identity)
+    current_communities.service.members.rebuild_index(system_identity)
+    click.echo("done.")
+
+    # rebuilding users and groups
+    click.echo("indexing users and groups... ", nl=False)
+    current_users_service.rebuild_index(system_identity)
+    current_groups_service.rebuild_index(system_identity)
+    click.echo("done.")
+
+    # rebuilding requests and request events
+    click.echo("indexing requests and request events... ", nl=False)
+    current_requests_service.rebuild_index(system_identity)
+    current_events_service.rebuild_index(system_identity)
+    click.echo("done.")
+
+    # rebuilding vocabularies
+    click.echo("indexing vocabularies...")
+    current_vocabularies = current_app.extensions["invenio-vocabularies"]
+    svc_names = (n for n in vars(current_vocabularies) if n.endswith("service"))
+    services = ((name, getattr(current_vocabularies, name)) for name in svc_names)
+    for name, service in services:
+        click.echo(f"> {name}... ", nl=False)
+        service.rebuild_index(system_identity)
+        click.echo("done.")