Find Elasticsearch records where a field is an array instead of a simple String

find_arrays.sh

curl -w "\n" -XDELETE localhost:9200/scrap

curl -w "\n" -XPUT localhost:9200/scrap/ -d '
index :
    number_of_replicas : 0
'

curl -w "\n" -XPUT localhost:9200/scrap/script-demo/1?refresh=1 -d '{
    "fieldA" : "test string 1"
}'

curl -w "\n" -XPUT localhost:9200/scrap/script-demo/2?refresh=1 -d '{
    "fieldA" : [
        "test string 1",
        "test string 2"
    ]
}'

curl -w "\n" -XPUT localhost:9200/scrap/script-demo/3?refresh=1 -d '{
    "fieldA" : [
        "test string 1"
    ]
}'

curl -w "\n" -XPOST localhost:9200/scrap/script-demo/_search -d '{
    "query" : {
        "filtered" : {
            "filter" :{
                "script" : {
                    "script" : "_source.fieldA.getClass() != String"
                }
            }
        }
    }
}' | python -m json.tool