The FamilySearch description of the record set indicates that this index may also be foud online on JewishGen. However, it is not clear from browsing JewishGen's Hungarian databases where this might be located (JewishGen do not seem to have a record set with exactly 11,066 records).
The citation for this collection is:
“Hungary, Jewish Vital Records, 1800-1945,” database, FamilySearch Record Search ([ https://familysearch.org/ Record Search]); from Magyar Orszagos Leveltar (Hungary). “Index of Jewish vital records from the Kingdom of Hungary". Magyar Orszagos Leveltar (Hungary), Budapest. FHL microfilm, 26 reels. Family History Library, Salt Lake City, Utah.