IPB/applications/gallery/setup/upg_107624/queries.json

{
    "1": {
        "method": "addIndex",
        "params": [
            "gallery_images",
            {
                "type": "key",
                "name": "caption",
                "columns": [
                    "image_caption"
                ],
                "length": [
                    250
                ]
            }
        ]
    }
}