search-mailbox -deletecontent fails ???

I Ran a command to search a mailbox with -estimateresultonly it found 30 documents
I ran a second command to delete those documents and got a positional parameter error.

I want to delete those 30 documents but i don't understand why i got the error

[PS] C:\>search-mailbox -identity 'XXXXXXXXXXXXXXXXXX' -searchquery 'from:""' -estimateresultonly

RunspaceId       : cea1cf4c-3d9e-4dae-ad85-8e7111966d33
Identity         : Client Management/REGIONS/CENTRAL/USERS/XXXXXXXXXXXX
DisplayName      : XXXXXXXXXXXXXX
TargetMailbox    :
TargetPSTFile    :
Success          : True
TargetFolder     :
ResultItemsCount : 30
ResultItemsSize  : 145.8 KB (149,278 bytes)

[PS] C:\>search-mailbox -identity 'XXXXXXXXXXXXXX' -searchquery 'from:""' -deletecontent
A positional parameter cannot be found that accepts argument '-deletecontent'.
    + CategoryInfo          : InvalidArgument: (:) [Search-Mailbox], ParameterBindingException
    + FullyQualifiedErrorId : PositionalParameterNotFound,Search-Mailbox