public DomainFile findFirstByFSRL(FSRL fsrl) {
		fsrl = fsrl.withMD5(null);
		List<DomainFile> files = lookupFiles(IndexType.FSRL, fsrl);
		return !files.isEmpty() ? files.get(0) : null;
	}
@param indexType IndexType enum
@param mappingFunc bifunc that returns value that will be used to lookup the file
@param indexedFiles map of index keyvalue to fileId (either string or list of strings)
Ghidra/Features/Base/src/main/java/ghidra/plugin/importer/ProjectIndexService.java