IndiGo has released its official statement on the hacking incident, which happened earlier this month on the IndiGo servers.
IndiGo official statement
We would like to make this disclosure that some of our servers were subject to a hacking incident earlier this month. We were able to restore our systems in a very short span of time with minimal impact. There were some segments of data servers that were breached – so, there is a possibility that some internal documents may get uploaded by the hackers on public websites and platforms. We realise the seriousness of the issue, and are continuing to engage with all relevant experts and law enforcement to ensure that the incident is investigated in detail.