The topic is created and here are its parameters.
General settings
name
testtopic
partitions
1
compression.type
producer
confluent.value.schema.validation
false
leader.replication.throttled.replicas
confluent.key.subject.name.strategy
io.confluent.kafka.serializers.subject.TopicNameStrategy
message.downconversion.enable
true
min.insync.replicas
1
segment.jitter.ms
0
cleanup.policy
delete
flush.ms
9223372036854775807
confluent.tier.local.hotset.ms
86400000
follower.replication.throttled.replicas
confluent.tier.local.hotset.bytes
-1
confluent.value.subject.name.strategy
io.confluent.kafka.serializers.subject.TopicNameStrategy
segment.bytes
1073741824
retention.ms
604800000
flush.messages
9223372036854775807
confluent.tier.enable
false
confluent.tier.segment.hotset.roll.min.bytes
104857600
confluent.segment.speculative.prefetch.enable
false
message.format.version
3.0-IV1
max.compaction.lag.ms
9223372036854775807
file.delete.delay.ms
60000
max.message.bytes
20971520
min.compaction.lag.ms
0
message.timestamp.type
CreateTime
preallocate
false
confluent.placement.constraints
min.cleanable.dirty.ratio
0.5
index.interval.bytes
4096
unclean.leader.election.enable
false
retention.bytes
-1
delete.retention.ms
86400000
confluent.prefer.tier.fetch.ms
-1
confluent.key.schema.validation
false
segment.ms
604800000
message.timestamp.difference.max.ms
9223372036854775807
segment.index.bytes
10485760
But here is the automatically created topic, it also has max.message.bytes
20000000
General settings
name
TESSA35-SQL-TT.dbo.FileContent
partitions
1
compression.type
producer
confluent.value.schema.validation
false
leader.replication.throttled.replicas
--
confluent.key.subject.name.strategy
io.confluent.kafka.serializers.subject.TopicNameStrategy
message.downconversion.enable
true
min.insync.replicas
1
segment.jitter.ms
0
cleanup.policy
delete
flush.ms
9223372036854775807
confluent.tier.local.hotset.ms
86400000
follower.replication.throttled.replicas
confluent.tier.local.hotset.bytes
-1
confluent.value.subject.name.strategy
io.confluent.kafka.serializers.subject.TopicNameStrategy
segment.bytes
1073741824
retention.ms
604800000
flush.messages
9223372036854775807
confluent.tier.enable
false
confluent.tier.segment.hotset.roll.min.bytes
104857600
confluent.segment.speculative.prefetch.enable
false
message.format.version
3.0-IV1
max.compaction.lag.ms
9223372036854775807
file.delete.delay.ms
60000
max.message.bytes
20000000
min.compaction.lag.ms
0
message.timestamp.type
CreateTime
preallocate
false
confluent.placement.constraints
min.cleanable.dirty.ratio
0.5
index.interval.bytes
4096
unclean.leader.election.enable
false
retention.bytes
-1
delete.retention.ms
86400000
confluent.prefer.tier.fetch.ms
-1
confluent.key.schema.validation
false
segment.ms
604800000
message.timestamp.difference.max.ms
9223372036854775807
segment.index.bytes
10485760