fix: mandate numbers in admin pass

[alex-reiff]

Description

fix for https://github.com/terraform-ibm-modules/terraform-ibm-icd-elasticsearch/issues/300

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[alex-reiff]

/run pipeline

[alex-reiff]

adding the min_numeric field tripped upgrade test, skipping.

[alex-reiff]

/run pipeline

[terraform-ibm-modules-ops]

:tada: This PR is included in version 1.20.3 :tada:

The release is available on:

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• v1.20.3

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