1. A method comprising: disambiguating, by a disambiguation computer, a document feature from an electronic document by way of: extracting, via a feature extraction computer, the document feature from the electronic document, and linking, by the linking computer, the extracted document feature, to a set of document features having a primary document feature and a secondary document feature stored in a knowledge database of document features of a plurality of electronic documents, the secondary document feature including a proximity cluster of co-occurring features in the plurality of electronic documents; and adding, by an in-memory database computer, the disambiguated document feature to the knowledge database of co-occurring document features when the disambiguated document feature matches a document feature of interest in an alert database based at least in part on the linked set of document features including the proximity cluster; and generating, by a computer, an electronic user alert regarding the matching.