private void ensurePeersIsMutable() {
                if (!((bitField0_ & 0x00000004) == 0x00000004)) {
                    peers_ = new com.google.protobuf.LazyStringArrayList(peers_);
                    bitField0_ |= 0x00000004;
                }
            }
<code>required .jraft.EntryType type = 2;</code>
jraft-core/src/main/java/com/alipay/sofa/jraft/entity/RaftOutter.java