14. The system of claim 10 , wherein generating the compressed sequence of tokens includes generating, for each cluster, document reconstruction data that comprises a sequence of add elements and copy elements, the add elements each indicating a string of tokens to be added to the compressed sequence of tokens and to a reconstruction of a corresponding document, and the copy elements each indicating a token position in the compressed sequence of tokens and a quantity of tokens to be copied from the compressed sequence of tokens, starting at the indicated token position, to the reconstruction of the corresponding document.
14. The system of claim 10 , wherein generating the compressed sequence of tokens includes generating, for each cluster, document reconstruction data that comprises a sequence of add elements and copy elements, the add elements each indicating a string of tokens to be added to the compressed sequence of tokens and to a reconstruction of a corresponding document, and the copy elements each indicating a token position in the compressed sequence of tokens and a quantity of tokens to be copied from the compressed sequence of tokens, starting at the indicated token position, to the reconstruction of the corresponding document. 15. The system of claim 14 , wherein the indicated quantity of tokens is at least a predefined count of tokens.