const aggregateParams = {
 filter: {
   and: [
     { range:{ property: 'temperature', gt:4.54 } },
     { stWithin: { property:'location', value:'POLYGON((60.547602 -5.423433, 60.547602 -6.474416, 60.585858 -5.423433, 60.547602 -5.423433))' } }
  ]
 },
 property: 'temperature',
 aggregates: ['min', 'max', 'average'],
 groupBy: ['category']
};

const featureStream = await client.geospatial.feature.searchStream('ocean_temperature', aggregateParams);

{
  "items": [
    {
      "category": "first category",
      "max": 12.3,
      "min": 0.5,
      "average": 5.32
    },
    {
      "category": "second category",
      "max": 14.3,
      "min": 0.7,
      "average": 8.32
    }
  ]
}