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Find empty strings in elasticsearch


Find empty strings in elasticsearch

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Find empty strings in elasticsearch
Tag : elasticsearch , By : Arnaud Goudsmit
Date : November 24 2020, 05:44 AM


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Querying ElasticSearch to order empty strings last


Tag : django , By : mylonov
Date : March 29 2020, 07:55 AM
wish helps you This query assigns _score of 1.0 to all records with non-empty version and _score of 2.0 to all records with empty version. Then it sorts by _score in ascending order and then by version in ascending order. As a result, all records with empty version are pushed to the bottom of the list.
{
    "query": {
        "custom_filters_score" : {
            "query" : {
                "constant_score": {
                    "query": {
                        .... your original query ....                        
                    }
                }
            },
            "filters" : [
                {
                    "filter" : { "missing" : { "field" :  "version"} },
                    "boost" : "2"
                }
            ]
        }        
    },
    "sort": [
        {
            "_score": {"order":"asc"}
        },
        {
            "version": {"order":"asc"}
        }
    ]
}

Find documents with empty string value on elasticsearch


Tag : elasticsearch , By : user179190
Date : March 29 2020, 07:55 AM
this will help If you are using the default analyzer (standard) there is nothing for it to analyze if it is an empty string. So you need to index the field verbatim (not analyzed). Here is an example:
Add a mapping that will index the field untokenized, if you need a tokenized copy of the field indexed as well you can use a Multi Field type.
PUT http://localhost:9200/test/_mapping/demo
{
  "demo": {
    "properties": {
      "_content": {
        "type": "string",
        "index": "not_analyzed"
      }
    }
  }
}
/POST http://localhost:9200/test/demo/1/
{
  "_content": ""
}

/POST http://localhost:9200/test/demo/2
{
  "_content": "some content"
}
POST http://localhost:9200/test/demo/_search
{
  "query": {
    "filtered": {
      "filter": {
        "term": {
          "_content": ""
        }
      }
    }
  }
}
{
    took: 2,
    timed_out: false,
    _shards: {
        total: 5,
        successful: 5,
        failed: 0
    },
    hits: {
        total: 1,
        max_score: 0.30685282,
        hits: [
            {
                _index: test,
                _type: demo,
                _id: 1,
                _score: 0.30685282,
                _source: {
                    _content: ""
                }
            }
        ]
    }
}

Elasticsearch indexed search template generates empty strings in array


Tag : elasticsearch , By : Johannes
Date : March 29 2020, 07:55 AM
With these it helps I've seen this requirement before and the solution looks hacky, but it works. Basically, the commas in the template are the problem because Mustache will go over the array and for each element in the array will put the element - {{.}} - but also the comma you are specifying inside {{#myTerms}} and {{/myTerms}}.
And, also, in your case you shouldn't use double quotes - "{{.}}" because the element itself will be surrounded with double quotes. That's why you are seeing "1" in the result. But, if you want to match numbers that should be a list of numbers, not strings.
POST /_search/template/myTemplate
{"template":"{\"filter\":{\"bool\":{\"must\":[{\"terms\":{\"myTerms\":[{{#myTerms}}{{value}}{{#comma}},{{/comma}}{{/myTerms}}],\"_cache\":true}}]}}}"}
{
  "template": {
    "id": "myTemplate"
  },
  "params": {
    "myTerms": [{"value":1,"comma":true},{"value":2,"comma":true},{"value":4}]
  }
}
{
  "filter": {
    "bool": {
      "must": [
        {
          "terms": {
            "myTerms": [1,2,4],
            "_cache": true
          }
        }
      ]
    }
  }
}

java regex to find words in string finds empty strings in symbols like .,!(? and empty space


Tag : java , By : mdiezb
Date : March 29 2020, 07:55 AM
To fix the issue you can do This is my case string: ,
your question is not clear enough.
echo "This is a test.  How many???  " + "
 Senteeeeeeeeeences are here... there should 
 be 5!  Right?" | perl -lne 'print "@{[split( /[^\w]+/g )]}"'  

Can 'exists' be used to detect empty strings in ElasticSearch?


Tag : elasticsearch , By : Chaz
Date : March 29 2020, 07:55 AM
wish of those help Empty string such as "" is considered as field exists. To identify if the field is empty as per your definition you can use the query as below:
{
  "query": {
    "bool": {
      "should": [
        {
          "bool": {
            "must_not": [
              {
                "exists": {
                  "field": "someField"
                }
              }
            ]
          }
        },
        {
          "term": {
            "someField": ""
          }
        }
      ]
    }
  }
}
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