@java.lang.Override
    public boolean hasTargetGroupIndex() {
        return ((bitField0_ & 0x00000001) != 0);
    }
<code>optional int32 target_group_index = 2;</code>

@return Whether the targetGroupIndex field is set.
turms-client-kotlin/src/main/java/im/turms/client/model/proto/request/user/relationship/DeleteRelationshipGroupRequest.java