(PECL solr >= 0.9.2)
SolrDocument::__unset — Removes a field from the document
public SolrDocument::__unset ( string $fieldName ) : bool
Removes a field from the document when the field is access as an object property.
fieldName
The name of the field.
Returns true on success or false on failure.
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https://www.php.net/manual/en/solrdocument.unset.php