Geo-point and geo-shape types in Elasticsearch - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this geo-point query?

Given the following Elasticsearch query, what will be the number of hits returned if the index contains documents with geo-points at (40, -70), (41, -71), and (39, -69)?

Elasticsearch

{
  "query": {
    "geo_distance": {
      "distance": "100km",
      "location": {
        "lat": 40,
        "lon": -70
      }
    }
  }
}

A 0

B 2

C 3

D 1

💡 Hint

Think about which points fall within 100km radius of (40, -70).

Only the point at (40, -70) is within 100km of the center point. The points at (41, -71) and (39, -69) are approximately 140km away.

🧠 Conceptual

intermediate

Which geo-shape type represents a polygon with holes?

In Elasticsearch geo-shape types, which of the following correctly represents a polygon with holes inside it?

A A MultiPoint with points inside the polygon area

B A LineString with multiple segments forming a closed loop

C A Polygon with multiple linear rings, where the first ring is the outer boundary and subsequent rings are holes

D A Point with a radius representing the hole

💡 Hint

Think about how polygons with holes are defined in geojson format.

Polygons with holes are defined by multiple linear rings: the first is the outer boundary, others are holes inside.

🔧 Debug

advanced

Why does this geo_shape query fail?

This geo_shape query returns an error. What is the cause?

Elasticsearch

{
  "query": {
    "geo_shape": {
      "location": {
        "shape": {
          "type": "circle",
          "coordinates": [-70, 40],
          "radius": "100km"
        },
        "relation": "intersects"
      }
    }
  }
}

A Elasticsearch does not support 'circle' type in geo_shape queries

B The coordinates are in wrong order; should be [lat, lon]

C The radius value must be a number, not a string

D The relation 'intersects' is invalid for geo_shape queries

💡 Hint

Check the supported geo_shape types in Elasticsearch.

Elasticsearch geo_shape does not support 'circle' type; it supports types like Point, Polygon, MultiPolygon, etc.

📝 Syntax

advanced

Identify the syntax error in this geo-point mapping

Which option contains the correct syntax for defining a geo_point field in an Elasticsearch mapping?

A "location": { "type": "geo_point" }

B "location": { "geo_point": true }

C "location": { "type": "geo-point" }

D "location": { "type": "point_geo" }

💡 Hint

Check the exact spelling of the geo_point type.

The correct type name is 'geo_point' without hyphen or other variations.

🚀 Application

expert

How many shapes are indexed with this geo_shape document?

Given this document indexed in Elasticsearch with a geo_shape field 'area': { "area": { "type": "geometrycollection", "geometries": [ { "type": "point", "coordinates": [100.0, 0.0] }, { "type": "linestring", "coordinates": [[101.0, 0.0], [102.0, 1.0]] }, { "type": "polygon", "coordinates": [[[100.0, 0.0], [101.0, 0.0], [101.0, 1.0], [100.0, 1.0], [100.0, 0.0]]] } ] } } How many individual shapes does this geo_shape field contain?

A 0

B 3

C 1

D 4

💡 Hint

Count each geometry inside the GeometryCollection.

A GeometryCollection contains multiple geometries; here there are 3: a point, a linestring, and a polygon.