Find empty strings in elasticsearch

Question

I\'m trying to _search documents that has some specific value in the field.

{
  \"query\": {
      \"bool\": {
        \"must\": [
         {\"f         


        

Answer 1

Or another way to do the same thing more efficiently is to use the exists filter:

"exists" : {
  "field" : "advs.status"
}

Both are valid, but this one is better :)

Answer 2

You can try this temporary solution which works but isn't optimal - https://github.com/elastic/elasticsearch/issues/7515

PUT t/t/1
{
"textContent": ""
}

PUT t/t/2
{
 "textContent": "foo"
}

GET t/t/_search
{
 "query": {
  "bool": {
   "must": [
    {
      "exists": {
        "field": "textContent"
      }
    }
  ],
  "must_not": [
    {
      "wildcard": {
        "textContent": "*"
      }
     }
   ]
  }
 }
}

Answer 3

If tou want to search for fields containing an empty string, either you change your mapping to set not_analyzed to this particular field or you can use a script filter:

"filter": {
  "script": {
    "script": "_source.advs.status.length() == 0"
  }
}

Answer 4

the "missing" does work only for null values or not being there at all. Matching empty string was already answered here: https://stackoverflow.com/a/25562877/155708

Answer 5

I generally use a filter if the field is not analyzed. Here is snippet:

{
  "filtered": {
    "filter": {
      "term": {
        "field": ""
      }
    }
  }
},

Answer 6

Try using must_not with missing in your bool:

"must_not":{
  "missing":{
    "field":"advs.status",
    "existence":true,
    "null_value":true
  }
}