带有聚合的 Searchkick (Elasticsearch) 直方图 - 扩展边界

Question

I'm using the searchkick gem in a Rails app to access Elasticsearch data. I use the aggregations feature to display a histogram on price; the relevant part of the body_options looks like this:

            price: {
                histogram: {
                    field: :low_rate,
                    interval: 50
                }
            }

The issue I'm having is that I also need to be able to provide a filter on low_rate. So, for example, if I initially have a histogram that has a range of rates between $50 and $500, and I add to the next query where low_rate < 300 , the histogram buckets are recalculated and the chart is entirely redrawn. But in my app I need the chart to still show the same buckets.

This is a pretty common behavior on filters -- see the example below from Airbnb's site, which shows the chart after the upper limit being dragged down -- and so I'm hoping someone might be able to provide some advice about how to achieve this using searchkick.

Answer 1

I can help you with ES Query if it helps.

{
  "size": 0, 
  "aggs": {
    "hist": {
      "histogram": {
        "field": "low_rate",
        "interval": 50,
        "extended_bounds": { // <======= It is used to extend bounds
          "min": 50,      // <========== Specify the min bound
          "max": 500      // <========== Specify the max bound
        },
          "missing":10    // <========== value of the missing docs in the range
      }
    }
  }
}