"Also, Judah, there is a harvest appointed for you, When I restore the fortunes of my people.
"The turning of captivity ..." or "bringing back the captivity" of God's people is a formula, for, "the restoration of the lost fortune, or the well-being of a whole people, or of a person."  An example of this usage is found in  Job 42:10: "And the Lord turned the captivity of Job." This was stated concerning, that patriarch, despite the fact of his never have been either in prison, or carried away captive to some other land. All such speculations as the restoration of Palestine to the Jews and various millennial theories have no connection whatever with this passage.