elasticsearchHow can I use wildcards in Elasticsearch queries?

Wildcards in Elasticsearch queries allow for the use of pattern matching to search for specific strings of text. To use wildcards, the wildcard query should be used. For example, to search for documents containing the string hello with any character before and after, the following query can be used:

GET /_search
{
  "query": {
    "wildcard" : {
      "content" : "*hello*"
    }
  }
}

This query will return any documents containing the string hello with any other characters before and after.

The wildcard query supports two types of wildcards: * and ?. * is a wildcard for any number of characters, while ? is a wildcard for a single character. For example, to search for documents containing the string hello with any single character before and after, the following query can be used:

GET /_search
{
  "query": {
    "wildcard" : {
      "content" : "?hello?"
    }
  }
}

This query will return any documents containing the string hello with any single character before and after.

Wildcards can also be used with the fuzzy query. The fuzzy query allows for fuzzy matching, which means that it will match documents that are similar to the given string. For example, to search for documents containing similar strings to hello, the following query can be used:

GET /_search
{
  "query": {
    "fuzzy" : {
      "content" : "hello"
    }
  }
}

This query will return any documents containing strings similar to hello.

Wildcards can be a powerful tool for searching for specific strings of text in Elasticsearch.

Parts of code and explanation

• GET /_search: This is the endpoint used to query the Elasticsearch cluster.
• wildcard: This is the query type used to search for documents containing strings with wildcards.
• content: This is the field in the documents that is being searched.
• *: This is a wildcard for any number of characters.
• ?: This is a wildcard for a single character.
• fuzzy: This is the query type used to search for documents containing strings similar to the given string.

Relevant links

• Elasticsearch Wildcard Query
• Elasticsearch Fuzzy Query

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