Keycloak data base connection pool

Configuring the server
1

I have this config in my standalone-ha.xml in datasource tag

<pool>
    <min-pool-size>50</min-pool-size>
    <max-pool-size>150</max-pool-size>
    <prefill>true</prefill>
    <use-strict-min>false</use-strict-min>
    <flush-strategy>FailingConnectionOnly</flush-strategy>
</pool>

but when my keycloak Kubernetes pod gets up, my pool tag has overridden with this

<pool>
    <flush-strategy>FailingConnectionOnly</flush-strategy>
</pool>

does any body know why this happened?