This file is indexed.

/usr/share/highlight/langDefs/txt.lang is in highlight-common 3.9-1+deb7u1.

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

The actual contents of the file can be viewed below.

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Description="Plain text"

Keywords={
}

Comments={
}

-- disable highlighting of numbers
Digits = Identifiers


EnableIndentation=true