This file is indexed.

/usr/share/nav_msgs/msg/Odometry.msg is in ros-nav-msgs 1.12.5-3.

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

The actual contents of the file can be viewed below.

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# This represents an estimate of a position and velocity in free space.  
# The pose in this message should be specified in the coordinate frame given by header.frame_id.
# The twist in this message should be specified in the coordinate frame given by the child_frame_id
Header header
string child_frame_id
geometry_msgs/PoseWithCovariance pose
geometry_msgs/TwistWithCovariance twist