10. A system, comprising: one or more processors; memory; and instructions stored in the memory and configured for execution by the one or more processors, the instructions comprising instructions to: identify a plurality of documents, from a set of documents, wherein each of the plurality of documents include a top N terms, wherein the top N terms are the same for each of the plurality of documents, wherein the top N terms are based on respective term frequency scores, and wherein N is an integer; identify at least a subset of the identified documents that satisfy a pattern string; and form a document cluster from at least the subset of the identified documents.
19. The system of claim 10 , wherein N is greater than or equal to 1.