Intro to clustering

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layer.featureReduction = {
  type: "cluster"
};

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        const clusterConfig = {
          type: "cluster",
          clusterRadius: "100px",
          // {cluster_count} is an aggregate field containing
          // the number of features comprised by the cluster
          popupTemplate: {
            title: "Cluster summary",
            content: "This cluster represents {cluster_count} earthquakes.",
            fieldInfos: [{
              fieldName: "cluster_count",
              format: {
                places: 0,
                digitSeparator: true
              }
            }]
          },
          clusterMinSize: "24px",
          clusterMaxSize: "60px",
          labelingInfo: [{
            deconflictionStrategy: "none",
            labelExpressionInfo: {
              expression: "Text($feature.cluster_count, '#,###')"
            },
            symbol: {
              type: "text",
              color: "#004a5d",
              font: {
                weight: "bold",
                family: "Noto Sans",
                size: "12px"
              }
            },
            labelPlacement: "center-center",
          }]
        };