lib/Gateway/Native.php
protected function getMainTranslationDocument(Document $document)
    {
        // Clone to prevent mutation
        $document = clone $document;
        $subDocuments = array();

        $document->id .= 'mt';
        $document->fields[] = new Field(
            'meta_indexed_main_translation',
            true,
            new FieldType\BooleanField()
        );

        foreach ($document->documents as $subDocument) {
            // Clone to prevent mutation
            $subDocument = clone $subDocument;

            $subDocument->id .= 'mt';
            $subDocument->fields[] = new Field(
                'meta_indexed_main_translation',
                true,
                new FieldType\BooleanField()
            );

            $subDocuments[] = $subDocument;
        }

        $document->documents = $subDocuments;

        return $document;
    }
protected function getMainTranslationDocument(Document $document)
    {
        // Clone to prevent mutation
        $document = clone $document;
        $subDocuments = array();

        $document->id .= 'mt';
        $document->fields[] = new Field(
            'meta_indexed_main_translation',
            true,
            new FieldType\BooleanField()
        );

        foreach ($document->documents as $subDocument) {
            // Clone to prevent mutation
            $subDocument = clone $subDocument;

            $subDocument->id .= 'mt';
            $subDocument->fields[] = new Field(
                'meta_indexed_main_translation',
                true,
                new FieldType\BooleanField()
            );

            $subDocuments[] = $subDocument;
        }

        $document->documents = $subDocuments;

        return $document;
    }
Returns version of the $document to be indexed in the always available core.

@param \eZ\Publish\SPI\Search\Document $document

@return \eZ\Publish\SPI\Search\Document