Changed x-use-read-transporter for searchSingleIndex

[aykutersoy]

Changed x-use-read-transporter for searchSingleIndex, the reason behind that is to be able to pass body when querying single index with filters

Closes #3698

🧭 What and Why

TBH I'm not 100% this the correct approach to the issue I've created (#3698) but it does the job when I set the filters in body attribute which was the case before v4

$searchResponse = $client->searchSingleIndex(
    indexName: $indexName,
    searchParams: ['query' => ''],
    requestOptions: [
        'body' => [
            'filters' => 'value=1',
        ],
    ],
);

🎟 JIRA Ticket:

Changes included:

• List changes

🧪 Test

[aykutersoy]

#3698 (comment)

Above comment solves the problem I had