private void ensureRecordsIsMutable() {
        com.google.protobuf.Internal.ProtobufList<com.google.protobuf.ByteString> tmp = records_;
        if (!tmp.isModifiable()) {
            records_ = com.google.protobuf.GeneratedMessageLite.mutableCopy(tmp);
        }
    }
<code>repeated bytes records = 3;</code>

@param index The index of the element to return.
@return The records at the given index.
turms-client-kotlin/src/main/java/im/turms/client/model/proto/request/message/UpdateMessageRequest.java