This file is indexed.

/usr/share/cmake-3.5/Modules/readme.txt is in cmake-data 3.5.1-1ubuntu1.

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

The actual contents of the file can be viewed below.

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See the "Find Modules" section of the cmake-developer(7) manual page.

For more information about how to contribute modules to CMake, see this page:
https://cmake.org/Wiki/CMake:Module_Maintainers