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Add xref to wildcard field type; correct URL for expensive-queries #9212

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Add xref to wildcard field type; correct URL for expensive-queries #9212

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3 changes: 2 additions & 1 deletion _query-dsl/term/regexp.md
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Expand Up @@ -29,7 +29,8 @@ Note the following important considerations:
- By default, the maximum length of a regular expression is 1,000 characters. To change the maximum length, update the `index.max_regex_length` setting.
- Regular expressions use the Lucene syntax, which differs from more standardized implementations. Test thoroughly to ensure that you receive the results you expect. To learn more, see [the Lucene documentation](https://lucene.apache.org/core/8_9_0/core/index.html).
- To improve regexp query performance, avoid wildcard patterns without a prefix or suffix, such as `.*` or `.*?+`.
- `regexp` queries can be expensive operations and require the [`search.allow_expensive_queries`]({{site.url}}{{site.baseurl}}/query-dsl/index/#expensive-queries) setting to be set to `true`. Before making frequent `regexp` queries, test their impact on cluster performance and examine alternative queries that may achieve similar results.
- `regexp` queries can be expensive operations and require the [`search.allow_expensive_queries`]({{site.url}}{{site.baseurl}}/query-dsl/#expensive-queries) setting to be set to `true`. Before making frequent `regexp` queries, test their impact on cluster performance and examine alternative queries that may achieve similar results.
- The [wildcard field type]({{site.url}}{{site.baseurl}}/field-types/supported-field-types/wildcard/) builds an index which is specially designed to be very efficient for wildcard and regular expression queries.

## Parameters

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