Durability requirement failed: The CAS on the active node changed for ID "Price_85646084", indicating it has been modified in the meantime, Why? What leads to this reason?

[xiger]

@simonbasle

When the cas of the mutated observed document and the cas known to the master node at the time of polling are different, the exception you see is thrown

What leads to the problem that the cas Value is changed ?
Because I now just do the insert mutation, and it didnot appear.