IndexImport builds an InDesign index from an external index. The external index is parsed and index markers are embedded at a page level in the InDesign document. Index entires are added and linked to the index markers.
When the generated index is exported to interactive PDF the links are maintained.
The embedded markers can be moved to the correct page location with MarkerMover.
If the pagination of the document changes and you have NOT moved the markers with MarkerMover, the index will need to be re-imported.