India is mentioned in many ways in Talmud, and clearly our sages had extensive trade with India, for example Kohen Gadol's garments and Ketoret ingredients see Mishnah and Talmud dealing-with-indian-reality-150-500-ce.
Rambam's brother David was a serious trader in India, and died in a shipwreck in the Indian sea Maimonides' brothers losing Rambam's money.
As our sages were very idolatry minded, and due to high resemblance of (at least parts of) Hinduism to idolatry, I would expect them either clarify their outlook on Hinduism or warn themselves and others of possibility of prohibited mixtures. As we know, Avoda Zarah disqualifies a mixture in any proportions, so one seed or one hair of sacrifices to Avoda Zarah would disqualify a whole ship full of the same sort.
I couldn't find though a single mentioning of a doubt or abstention from such trade on the grounds of (even sofek) Avodah Zarah.
Questions: Why is the serious doubt not mentioned?