Yes there is not a lot in the writings aimed directly and the Hindu Lines of Faith - This is One document that has explored it in detail -
Hinduism and the Bahá'í Faith
A Baha'i comes to the subject knowing that Baha'u'llah has confirmed Krishna is a Messenger from God and thus Followers of the teachings of Krishna do have the Light of God. The good thing is when we enter these conversations we too are learning more about what is found in the Hindu Faith. We will always look for the Light that is of God.
The Guardian has advised the Bahai's as to the
Hindu Religion
"...The origins of this and many other religions that abound in India are not quite known to us, and even the Orientalists and the students of religions are not in complete accord about the results of their investigations in that field. The Bahá'í writings also do not refer specifically to any of these forms of religion current in India. So, the Guardian feels it impossible to give you any definite and detailed information on that subject. He would urge you, however, to carry on your studies in that field, although its immensity is well-nigh bewildering, ..........." (From a letter written on behalf of Shoghi Effendi: Dawn of a New Day, p. 198)
To me this is no obstacle, it just means we are left to find the Oneness together, I would assume this is because there are a lot of points that we can agree on. Also during
Bahá'u'lláh's lifetime, he did encouraged some of his followers to move to India.
Reincarnation has been addressed in the Baha'i writings by Abdul'baha - The question was asked; "What is the truth of the question of reincarnation, which is believed by some people?"
The Answer.—"The object of what we are about to say is to explain the reality—not to deride the beliefs of other people; it is only to explain the facts; that is all. We do not oppose anyone’s ideas, nor do we approve of criticism..." - Link -
Bahá'í Reference Library - Some Answered Questions, Pages 282-289
Regards Tony