https://access.redhat.com/documentation/en-us/red_hat_data_grid/8.4/html-single/data_grid_operator_guide/index#configuring-clusters

As a user I want to securely define custom server configurations that require sensitive strings like credentials.

Users now specify credential alias/credential pairs via a dedicated secret which is configured in the Infinispan CR as follows:

spec: 
  security: 
    credentialStoreSecretName: user-secret

Secret:

apiVersion: v1
kind: Secret
metadata: 
  name: user-secret
type: Opaque
data: 
  cred1: sensitive-value
  cred2: sensitive-value2