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Elasticsearch: Querying for Non-Empty Fields
When working with Elasticsearch, there might be situations where you need to query documents based on the presence of a non-empty field. This article will guide you through the process of querying Elasticsearch for documents where a specific field is not empty.
Using the `exists` Query
The `exists` query can be used to find documents where a field exists and contains a non-null value. The basic syntax for the `exists` query is as follows:
{
"query": {
"exists": {
"field": "your_field_name"
}
}
}Replace `your_field_name` with the name of the field you want to check for non-empty values. Here’s an example that demonstrates how to use the `exists` query to find documents where the `email` field is not empty:
{
"query": {
"exists": {
"field": "email"
}
}
}Using the `bool` Query with `must_not` and `missing`
Another approach to find documents with non-empty fields is to use the `bool` query in combination with `must_not` and the `missing` query. The `missing` query is deprecated in Elasticsearch 5.x and removed in Elasticsearch 6.x, so this method is only applicable for Elasticsearch versions below 5.x.
The basic syntax for the `bool` query with `must_not` and `missing` is as follows:
{
"query": {
"bool": {
"must_not": {
"missing": {
"field": "your_field_name"
}
}
}
}
}Replace `your_field_name` with the name of the field you want to check for non-empty values. Here’s an example that demonstrates how to use the `bool` query with `must_not` and `missing` to find documents where the `email` field is not empty:
{
"query": {
"bool": {
"must_not": {
"missing": {
"field": "email"
}
}
}
}
}Keep in mind that this method is not recommended for Elasticsearch 5.x and later versions, as the `missing` query is deprecated and removed in those versions.
In conclusion
the `exists` query is the preferred method for querying documents with non-empty fields in Elasticsearch. The `bool` query with `must_not` and `missing` can be used for older Elasticsearch versions, but it is not recommended for newer versions due to the deprecation and removal of the `missing` query.
