KIP-185 — Make exactly once in order delivery the default producer setting

Discussion Kafka 1.0 ProducerTransactions

KIP-185 proposes changing the default producer configuration to enable idempotent delivery (`enable.idempotence=true`) and set `acks=all`, `max.in.flight.requests.per.connection=5`, and `retries=MAX_INT`, making exactly-once in-order delivery per partition the default behavior. The historical default (at-most-once, no ordering guarantee) was the weakest delivery semantic Kafka offers and was chosen for throughput, but Kafka 0.11 introduced idempotence at near-zero overhead, making the weak default no longer justified.

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