es_scan_size.sh

#!/bin/bash
set -o nounset
set -o errexit

echo "This script demonstrates inconsistencies between scan scrolls and scrolls with the default search type"
echo
echo "-- Create a test index and some documents"

curl -s -XPUT "http://localhost:9200/testindex" > /dev/null
curl -s -XPUT "http://localhost:9200/testindex/t/1" -d'
{
  "f": "foo1"
}' > /dev/null
curl -s -XPUT "http://localhost:9200/testindex/t/2" -d'
{
  "f": "foo2"
}' > /dev/null
curl -s -XPUT "http://localhost:9200/testindex/t/3" -d'
{
  "f": "foo3"
}' > /dev/null

echo "-- search_type=scan returns 0 results"
SID=$(curl -s -XGET "http://localhost:9200/testindex/_search?scroll=5m&size=1&search_type=scan" | jq -r ._scroll_id)

echo "-- Returns all 3 documents!"
curl -s -XGET "http://localhost:9200/_search/scroll?scroll_id=$SID&size=1" | jq '.hits.hits | length'

echo "-- Searching without the scan type returns values *and* honors size=1"
curl -s -XGET "http://localhost:9200/testindex/_search?scroll=5m&size=1" | jq '.hits.hits | length'
SID=$(curl -s -XGET "http://localhost:9200/testindex/_search?scroll=5m&size=1" | jq -r ._scroll_id)

echo "-- Scrolling remembers the size"
curl -s -XGET "http://localhost:9200/_search/scroll?scroll_id=$SID" | jq '.hits.hits | length'