private void ensureFromIdsIsMutable() {
        com.google.protobuf.Internal.LongList tmp = fromIds_;
        if (!tmp.isModifiable()) {
            fromIds_ = com.google.protobuf.GeneratedMessageLite.mutableCopy(tmp);
        }
    }
<code>repeated int64 from_ids = 4;</code>

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