geohash_grid aggregation: Add support for geo_shape

[nreese]

Would it be possible to enhance the geohash_grid aggregation to support geo_shape indexes. The functionality would be identical to geo_point with the only difference being that a document would get placed into each grid bucket that intersects the shape.

[clintongormley]

@nknize would this be feasible?

Related to #7574

[nknize]

I'll update the code for this to show how this can be done in the aggregation. Below is a code snippet for computing the geohash cells for a shape. It can be done for quad tree as well for natural mercator matching.

    // build poly
    ctx = JtsSpatialContext.GEO;
    Shape shape = ctx.readShapeFromWkt(wkt);

    // build geohash prefix tree and iterate intersecting cells
    CellIterator iter = new GeohashPrefixTree(ctx, 6).getTreeCellIterator(shape, 6);
    while (iter.hasNext()) {
      Cell c = iter.next();
      System.out.println(c);
    }

I am a little concerned about the complexity inside the aggregation framework.

[mikeurbach]

we talked about this at elasticon, it would be an awesome feature that my team would use a lot!

[rtrujill007]

👍

This would also greatly benefit us (Esri) as well!

[markharwood]

cc @elastic/es-search-aggs

[refaelasraf]

Have any updates about this question?

[cbuescher]

I am a little concerned about the complexity inside the aggregation framework.

This looks like we don't have agreement yet on whether this is feasible or not. I'll tag this for team discussion to see how we can move this forward or if we don't want to pursue this idea.