public Builder setGroupIndex(long value) {

            groupIndex_ = value;
            bitField0_ |= 0x00000008;
            onChanged();
            return this;
        }
<code>optional int64 group_index = 4;</code>

@param value The groupIndex to set.
@return This builder for chaining.
turms-server-common/src/main/java/im/turms/server/common/access/client/dto/model/user/UserRelationship.java