Punjabi contact with Indonesia is suggested by the term saka in Sindh and Punjab.
The beginning of the Saka era is widely equated to the ascension of Chashtana in 78 CE. Ptolemy 2nd century CE, "Geographia", qualifies the Western Satraps as "Indo-Scythians" and describes Chashtana's territory as Patalene Sindh in the West, his capital Ujjain in the east and beyond Barigaza in the south. Baruch / Barigaza traded with Indonesia.
The Bali Saka calendar is calculated from the beginning of the Saka Era in India, and is used with the Balinese pawukon calendar, and Balinese festivals can be calculated according to either . The Indian saka calendar was used for royal decrees as early as the ninth century CE. The same calendar was used in Java until Sultan Agung replaced it with the Javanese calendar in 1633. _ Haer, Debbie Guthrie; Morillot, Juliette & Toh, Irene (Eds) (1995) Bali, a Traveller's Companion, Editions Didier Millet. p 24 , 228.
"The Indonesian saka guru construction is employed in buildings that are constructed with a joglo-type or tajug-type (pyramidal) roofs. The joglo type roof is only reserved for the house of the nobles, while the tajug-type roof is used to support sacred buildings e.g. mosques or temples. Saka guru consists of the word saka and guru. According to the Javanese text of Kawruh Kalang, the guru or "teacher" is a title given to the four wooden beams, while saka or "post" is for the four main posts. Thus the whole configuration is known as sakaguru,.. "the saka which supports the guru".
In Indonesian language, the term saka guru is used to signifies a fundamental principle. For example, "the Indonesian Cooperative is the saka guru of the National Economy". " _ wiki saka guru.
This indicates the influence by various people from Punjab and their association with nobles. Logically that would extend to military service by Punjabis in Indonesia.