Steps to reproduce an OOM for geospatial queries against elasticsearch.

es-oom-repro.sh

# 1. Start ES with the following settings:
#  -Xms256m -Xmx1g -Xss256k

# 2. Create an index
curl -XPUT 'http://localhost:9200/test-index/' -d '{
  "settings": {
    "index": {
      "analysis.analyzer.default.type": "custom",
      "analysis.analyzer.default.tokenizer": "keyword",
      "analysis.analyzer.default.filter": ["lowercase"]
    }
  }
}'

# 3. Create a mapping
curl -XPUT 'http://localhost:9200/test-index/test-mapping/_mapping' -d'{
  "test-mapping": {
    "properties": {
      "geometry": {
        "type": "geo_shape",
        "tree": "quadtree",
        "tree_levels": 16,
        "distance_error_pct": 0.0
      }
    }
  }
}'

# 4. Perform a query
curl -XPOST 'http://localhost:9200/test-index/test-mapping/_search' -d'{
    "query": {
        "constant_score": {
            "boost": 1,
            "filter": {
                "geo_shape": {
                    "geometry": {
                        "verify": "within",
                        "shape": {
                            "type": "Envelope",
                            "coordinates": [
                                [-87.06, 38.69],
                                [-80.78, 25.77]
                            ]
                        },
                        "relation": "intersects"
                    }
                }
            }
        }
    }
}'

# After some time..
# java.lang.OutOfMemoryError: Java heap space
# Dumping heap to java_pid6585.hprof ...
# Exception in thread "elasticsearch[Carnivore][http_server_worker][T#1]" java.lang.OutOfMemoryError: Java heap space
# Exception in thread "elasticsearch[Carnivore][http_server_worker][T#1]" java.lang.OutOfMemoryError: Java heap space
# Exception in thread "elasticsearch[Carnivore][management][T#3]" java.lang.OutOfMemoryError: Java heap space
#   at org.elasticsearch.index.merge.scheduler.ConcurrentMergeSchedulerProvider.stats(ConcurrentMergeSchedulerProvider.java:69)
#   at org.elasticsearch.action.admin.indices.status.TransportIndicesStatusAction.shardOperation(TransportIndicesStatusAction.java:175)
#   at org.elasticsearch.action.admin.indices.status.TransportIndicesStatusAction.shardOperation(TransportIndicesStatusAction.java:59)
#   at org.elasticsearch.action.support.broadcast.TransportBroadcastOperationAction$AsyncBroadcastAction.performOperation(TransportBroadcastOperationAction.java:234)
#   at org.elasticsearch.action.support.broadcast.TransportBroadcastOperationAction$AsyncBroadcastAction.performOperation(TransportBroadcastOperationAction.java:211)
#   at org.elasticsearch.action.support.broadcast.TransportBroadcastOperationAction$AsyncBroadcastAction$1.run(TransportBroadcastOperationAction.java:187)
#   at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
#   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
#   at java.lang.Thread.run(Thread.java:662)