fields: {
    id: {
        type: 'uuid',
        rule: {
            required: true,
            message: 'id is required'
        }
    },
    userId: {
        type: 'int',
        rule: {
            required: true,
            message: 'userId is required'
        }
    },
    dateOfVisit: {
        type: 'timestamp',
        rule: {
            required: true,
            message: 'dateOfVisit is required'
        }
    },
    urlPort: 'int',
    urlHost: {
        type: 'text',
        rule: {
            required: true,
            message: 'urlHost is required'
        }
    },
    urlPath: 'text',
    urlQuery: 'text',
    urlProtocol: {
        type: 'text',
        rule: {
            required: true,
            message: 'urlProtocol is required'
        }
    },
    urlHash: 'text',
    pageTitle: 'text'
},
key: [['id'], 'dateOfVisit'],
clustering_order: {'dateOfVisit': 'desc'}