This file is indexed.

/usr/share/postgresql/9.4/extension/hll.control is in postgresql-hll 2.7-2.1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# Copyright 2013 Aggregate Knowledge, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# hll extension
comment = 'type for storing hyperloglog data'
default_version = '1.0'
module_pathname = '$libdir/hll'