[Search Documents]Deploy test resources failing in nightly runs

[zzhxiaofeng]

Search Documents nightly test runs are failing with:

Error message:
ConvertFrom-Json : Conversion from JSON failed with error: Unexpected character encountered while parsing value: $. Path '', line 1, position 2.
At D:\a_work_temp\c8fb1204-243c-4958-9d8f-af4078d50fdd.ps1:8 char:6
+'@ | ConvertFrom-Json -AsHashtable;
+CategoryInfo : NotSpecified: (:) [ConvertFrom-Json], ArgumentException
+FullyQualifiedErrorId : System.ArgumentException,Microsoft.PowerShell.Commands.ConvertFromJsonCommand
##[error]PowerShell exited with code '1'.
Finishing: Deploy test resources

For more details check here:
https://dev.azure.com/azure-sdk/internal/_build/results?buildId=3160364&view=results