This file is indexed.

/usr/share/lintian/overrides/libicu57 is in libicu57 57.1-6+deb9u2.

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

The actual contents of the file can be viewed below.

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# libicu57 installs multiple shared libraries, none of which is
# actually called libicu.so.57, but all of which are libicu*.so.57.
libicu57: package-name-doesnt-match-sonames