private void ensureCustomAttributesIsMutable() {
            if ((bitField0_ & 0x00000004) == 0) {
                customAttributes_ = new java.util.ArrayList<>(customAttributes_);
                bitField0_ |= 0x00000004;
            }
        }
<code>string content = 2;</code>

@param value The bytes for content to set.
@return This builder for chaining.
turms-server-common/src/main/java/im/turms/server/common/access/client/dto/request/group/enrollment/CreateGroupJoinRequestRequest.java