In the story, the lord says, "compel them to come in" (14:23). What does he mean, and who are they?

These are words inside the story Jesus tells, said by "The lord" to "the servant" (14:23). The servant has already brought in "the poor, maimed, blind, and lame" from "the streets and lanes of the city" (14:21), and has said, "Lord, it is done as you commanded, and there is still room" (14:22). Then the lord says, "Go out into the highways and hedges, and compel them to come in, that my house may be filled" (14:23). The story doesn't say who they are, beyond where the servant is sent, and it gives the lord's reason in his own words: "that my house may be filled". It doesn't tell how the servant did it, or whether the house was filled; it ends with the lord's words (14:24). Luke tells of no explanation of the story. These notes don't say whom the lord, the servant or those in the highways and hedges stand for, and apply compel to nothing and no one today.