If you see the gleaners in a dream, then such dream indicates the richness within your undertakings. If you were working with the gleaner, then it means you will win over some conflicts with your competitors.
Dream dictionary: Gleaners dream meanings
To see gleaners at work at harvest time, denotes prosperous business, and, to the farmer, a bountiful yield of crops. If you are working with the gleaners, you will come into an estate, after some trouble in establishing rights. For a woman, this dream foretells marriage with a stranger.