Elastic String Length Issue

Elastic Stack Elasticsearch
1

This works
GET indexname/_search
{
"query": {
"script": {
"script": "doc['fieldName'].value?.length() ==3"
}
}
}

But with < and > operator it does not work
GET indexname/_search
{
"query": {
"script": {
"script": "doc['fieldName'].value?.length() > 3"
}
}
}
fieldName is of String Type.
I am using ElasticSearch 5.3.

2

Hi,
it'd be helpful if you could tell us more about the problem occurring with the second query.
Also, just to make it sure, the type of fieldName is string or text?