This file is indexed.

/usr/share/mime-info/openjdk-8-archive.keys is in openjdk-8-jre 8u77-b03-3ubuntu3.

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

The actual contents of the file can be viewed below.

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application/java-archive
        description=Java Archive
        icon_filename=openjdk-8
        default_action_type=application
        default_application_id=java-archive
        short_list_application_user_additions=java-archive
application/x-java-archive
        description=Java Archive
        icon_filename=openjdk-8
        default_action_type=application
        default_application_id=java-archive
        short_list_application_user_additions=java-archive
application/x-jar
        description=Java Archive
        icon_filename=openjdk-8
        default_action_type=application
        default_application_id=java-archive
        short_list_application_user_additions=java-archive