1. A method for dynamically targeting and updating portions of an overloading index utilizing a dynamic update of index (DUI) object that exposes modified content of one or more documents, searchable via a merged index, the method comprising: determining that the DUI object is available; sending a request to download the DUI object; receiving the DUI object for use in updating the overloading index; and invoking an association process to group the merged index with the overloading index to facilitate searching updated portions within the overloading index corresponding to the modified content without rewriting the entire overloading index.