The `Modi script` was specifically used in the documents of the Marathas, option 4. The Maratha Empire, which spanned from 1674 to 1818, was located in the Indian subcontinent. During this period, the Marathas conducted their written communications in the `Modi script`, which was derived from the Devnagari script.

Option 1, Wodeyars, were the rulers of the Kingdom of Mysore in southern India and they did not employ the Modi script.

Option 2 refers to the Zamorins, a title given to the Hindu monarchs of Calicut, now Kozhikode, in Kerala, India. This was a completely different region from where the Modi script was used.

Option 3, the Hoysalas, were a ruling dynasty in southern India. They were also not known to use the Modi script in their historical documents.

In summary, the Modi script was specific to the Maratha Empire, thus making option 4 the correct answer.