DOD, DOJ or DHS federal security clearances such as the ones you mention are extremely rare and even harder to obtain, let alone maintain
the FBI will look back and do an extensive 10 year drill down on an SF-85 or 86 application for TS, CSI or SAP security clearances - it entails banking records, tax returns, police records, work history, credit reports, social presence identifiers, neighbor corroboration or affidavits, international travel records, etc. etc etc. It's about 30 fine print pages long, and can take upto 18 months to clear...
little story - when Trump took office in 2016, aprox. 87% of the staff that he initially brought in with him could not get the lowest level public trust security clearance on their 1st pass
people employed in the public service sector involving intelligence or security work will usually have federal security clearances if it involves government contracts - which can be especially lucrative.
INDEXR staff and its affiliates or companion counterpart companies have heavy background clearances - which means this is a unique breed of individuals coming into MONI...
whatever this INDEXR search engine is, the fact that it was conceived and has been in development for the past 15 years speaks some serious shit to me...hopefully, it appears to be all systems go for it's launch...