This file is indexed.

/usr/share/mime-info/icedtea-netx-web-start.keys is in icedtea-netx-common 1.6.2-3ubuntu1.

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/x-java-jnlp-file
        description=Java Web Start Application (IcedTea)
        icon_filename=sun-java
        default_action_type=application
        default_application_id=java-web-start
        short_list_application_user_additions=java-web-start