Rig veda II.15.6 says
सोदञ्चं सिन्धुमरिणान महित्वा वज्रेणान उषसः सं पिपेष | अजवसो जविनीभिर्विव्र्श्चन सो... ||
sodañcaṃ sindhumariṇān mahitvā vajreṇāna uṣasaḥ saṃ pipeṣa | ajavaso javinībhirvivṛścan so... ||
With mighty power he made the Sindhu (stream) flow upward, crushed with his thunderbolt the car of Uṣas, Rending her slow steeds with his rapid coursers. These things did Indra in the Soma's rapture.
My question is Was the act of Indra in turning the direction of Sindhu towards North (Rig veda II.15.6) historical or spiritual?
Some paleo-environmental scientists have proposed that the Hakkra was fed by Himalayan sources, which made it a mighty river, but dried-up between 2500 BCE and 1900 BCE, due to tectonic disturbances which caused a tilt in topography of Northwest India, resulting in the migration of rivers.
According to this theory, the Sutlej moved westward and became a tributary of the Indus River, while the Yamuna moved eastward and became a tributary of the Ganges, supposedly in the early 2nd millennium BCE, while reaching its current bed by 1st millennium BCE.
The river Sindhu might have changed its course towards North, which might have been allegorically mentioned in the Rig Veda.
In view of the above issue, I had added the word "historical" in my question.