This file is indexed.

/usr/share/appdata/gnome-calculator.appdata.xml is in gnome-calculator 1:3.10.2-0ubuntu1.

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

The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8"?>
<application>
  <id type="desktop">gcalctool.desktop</id>
  <licence>CC0</licence>
  <description>
    <p>
      GNOME Calculator is an application that solves mathematical equations.  Though it at first appears to be a simple calculator with only basic arithmetic operations, you can switch into Advanced, Financial, or Programming mode to find a surprising set of capabilities.
    </p>
    <p>
      The Advanced calculator supports many operations, including:
      <ul>
      <li>logarithms</li>
      <li>factorials</li>
      <li>trigonometric and hyperbolic trigonometric functions</li>
      <li>modulus (remainder) division</li>
      <li>complex numbers</li>
      <li>random number generation</li>
      <li>prime factorization</li>
      <li>unit conversions (angle, length, area, volume, weight, duration, temperature, currency, and time)</li>
      </ul>
    </p>
    <p>
      Financial mode supports several computations, including periodic interest rate, present and future value, double declining and straight line depreciation, and many others.
    </p>
    <p>
      Programming mode supports conversion between common bases (binary, octal, decimal, and hexadecimal), boolean algebra, one’s and two’s complementation, character to character code conversion, and more.
    </p>
  </description>
  <url type="homepage">https://wiki.gnome.org/Calculator</url>
  <screenshots>
    <screenshot type="default">https://wiki.gnome.org/Calculator?action=AttachFile&do=get&target=gcalctool.png</screenshot>
  </screenshots>
</application>