I did the same search, and found that it brought up articles where the word "undocumented" was mentioned once, but the individuals and the "community" were described throughout the article as immigrants, period.  Not illegal immigrants, not undocumented immigrants, just immigrants.  This isn't just nomenclature, it's nomenclature designed to make an equivalency between illegal immigrants and legal immigrants, as if there is really no difference.  I know legal immigrants, and this equivalency is offensive.  Many articles don't use the word illegal at all.  They talk about "fear in the immigrant community" when in fact, legal immigrants aren't fearful in the least, because they didn't do anything wrong.