Não há nada de grave. Você pode perder algumas funcionalidades (veja a descrição abaixo), mas se você não precisa, você pode remover o pacote (apenas tome cuidado para não desinstalar nenhum outro pacote). Se mais tarde você descobrir que foi um erro, poderá instalá-lo novamente.
Description: maintenance and search tools for a Xapian index of Debian packages
This package provides update-apt-xapian-index, a tool to maintan a Xapian
index of Debian package information in /var/lib/apt-xapian-index, and
axi-search, a command line search tool that uses the index.
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axi-cache allows to search packages very quickly, and it also interfaces with
the shell command line completion in a smart way, providing context-sensitive
keyword and tag suggestions even before the search command is actually run.
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update-apt-xapian-index allows plugins to be installed in
/usr/share/apt-xapian-index to index all sorts of extra information, such as
Debtags tags, popcon information, package ratings and anything else that would
fit.
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The index generated by update-apt-xapian-index is self-documenting, as it
contains an autogenerated README file with information on the index layout and
all the data that can be found in it.