@Override
    public String toString() {
        return "RegionEngine{" + "region=" + region + ", isLeader=" + isLeader() + ", regionOpts=" + regionOpts + '}';
    }
Minimum execution/copy unit of RheaKVStore.

@author jiachun.fjc
jraft-rheakv/rheakv-core/src/main/java/com/alipay/sofa/jraft/rhea/RegionEngine.java