in crossdc-consumer/src/main/java/org/apache/solr/crossdc/consumer/KafkaCrossDcConsumer.java [361:367]
private boolean hasDeletes(UpdateRequest ureq) {
if (ureq == null) {
return false;
}
return (ureq.getDeleteByIdMap() != null && !ureq.getDeleteByIdMap().isEmpty()) ||
(ureq.getDeleteQuery() != null && !ureq.getDeleteQuery().isEmpty());
}