While talking about Dharma changing with age (Yugas), Yudhistira says

Then again, it is seen that when some wicked persons of great might cause certain portions of certain courses of righteous acts to be stopped, these are destroyed for ever.

The furniture for this says:

The commentator cites the instance of the stoppage of the Horse-sacrifice in consequence of the interference of Indra with Janamejaya while the latter was bent upon celebrating one for the acquisition of merit.

Can someone please explain the horse sacrifice stopped by Indra.

While talking about Dharma changing with age (Yugas), Yudhistira says

Then again, it is seen that when some wicked persons of great might cause certain portions of certain courses of righteous acts to be stopped, these are destroyed for ever.

The footnote for this says:

The commentator cites the instance of the stoppage of the Horse-sacrifice in consequence of the interference of Indra with Janamejaya while the latter was bent upon celebrating one for the acquisition of merit.

Can someone please explain the horse sacrifice stopped by Indra, and did it stop Ashwameda forever? If it did stop Ashwameda, Pandavas did it afterwards?