This file is indexed.

/usr/share/glib-2.0/schemas/10_evolution-common.gschema.override is in evolution-common 3.12.9~git20141130.241663-1.

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

The actual contents of the file can be viewed below.

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[org.gnome.evolution.mail]
prompt-check-if-default-mailer=false