The Essenes were a Jewish sect. They never heard of Jesus because they lived before Jesus lived. They never heard of Christians for the same reason. The dead sea scrolls were written before Jesus. The Essenes forbade the books of Moses for some reason, they also did not take anyone as slaves, so not really Christian.
All the Old Testament Books were written long before Christ , as well, but like the Dead Sea Scrolls . Most of the ancient Prophets foretold of the coming of the Saviour.
I think most Jews would disagree about the Jewish scriptures foretelling Jesus. Their idea of a messiah is completely different than who Jesus was. I think Christian claims about prophesy was looking back after the fact and searching scripture for anything that would bolster their claims about Jesus. This is not true prophecy. This is the sort of thing the followers of Nostradamus do. They take an event like 9/11 and look through his writings that sort of "fit", and then claim it is prophecy.