application.yml:

spring:
  datasource:
    hikari:
      auto-commit: false 
  jpa:
    properties:
      hibernate:
        connection:
          provider_disables_autocommit: true

spring.datasource.hikari.auto-commit configures Hikari to execute setAutoCommit(false) on the new JDBC connection to be added to the pool.

hibernate.connection.provider_disables_autocommit configures Hibernate with a flag indicating that the connection provider already disabled the auto-commit mode before passing the connection to the application.
This prevents Hibernate from retrieving a connection to check and disable the auto-commit mode, which in turn delays the connection acquisition until Hibernate executes the first SQL statement of the service method implementation.