In the Rig-Veda there is one Apsaras, wife of Gandharva; in the later scriptures there are many Apsaras who act as the handmaidens of Indra and dance before his throne.
He is celebrated as a dual divinity with Indra, Agni, Pushan or Rudra, in other books.
They are the companions of Indra, and associated with him in the wielding of thunderbolts, sometimes as his equals, sometimes as his servants.
164.46, " Men call him Indra, Mitra, Varuna, Agni...
Ra, the sun, fought the big serpent Apap, as Indra fought Vrittra.