A collective mind is read as fear of losing your individuality to a group. Tradition also sees the comfort of belonging, and asks what is lost when everyone thinks alike.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.