1. A computer-implemented method for processing audio content, comprising: generating word lattices for the audio content, the word lattices containing a plurality of word candidates and nodes that represent connections between the word candidates and encoding times; expanding a decorated query that was decorated with desired confidence levels into a plurality of decorated queries corresponding to the desired confidence levels; and indexing the word lattices using a text indexer of a full-text search engine and the plurality of decorated queries such that the audio content is contained in a full-text index as indexed audio content.