José Nicolau da Fonseca, in his book, “An historical and archeological sketch of the city of Goa”, page 155, claims there were synagogues in the city of Ela. There were also a Rua dos Judeus (The street of the Jews) in the city, page 313.
Download a free copy (PDF-file) of the book of Fonseca.
The book can also be purchased at Broadway Book Center in Panjim. Goa. Broadway also has a shop in Dubai.