lib/DocumentMapper/NativeDocumentMapper.php
private function getBlockFields(Content $content)
    {
        $fields = [];

        if ($this->blockFieldMapper->accept($content)) {
            $fields = $this->blockFieldMapper->mapFields($content);
        }

        return $fields;
    }
private function getBlockFields(Content $content)
    {
        $fields = [];

        if ($this->blockFieldMapper->accept($content)) {
            $fields = $this->blockFieldMapper->mapFields($content);
        }

        return $fields;
    }
Returns an array of fields for the given $content, to be added to the
corresponding block documents.

@param \eZ\Publish\SPI\Persistence\Content $content

@return \eZ\Publish\SPI\Search\Field[]