The [JQL](https://confluence.atlassian.com/x/egORLQ) that defines the search. Note: * If no JQL expression is provided, all issues are returned. * `username` and `userkey` cannot be used as search terms due to privacy reasons. Use `accountId` instead. * If a user has hidden their email address in their user profile, partial matches of the email address will not find the user. An exact match is required.

The index of the first item to return in a page of results (page offset).

The maximum number of items to return per page. To manage page size, Jira may return fewer items per page where a large number of fields or properties are requested. The greatest number of items returned per page is achieved when requesting `id` or `key` only.

Determines how to validate the JQL query and treat the validation results. Supported values are: * `strict` Returns a 400 response code if any errors are found, along with a list of all errors (and warnings). * `warn` Returns all errors as warnings. * `none` No validation is performed. * `true` *Deprecated* A legacy synonym for `strict`. * `false` *Deprecated* A legacy synonym for `warn`. Note: If the JQL is not correctly formed a 400 response code is returned, regardless of the `validateQuery` value.

A list of fields to return for each issue, use it to retrieve a subset of fields. This parameter accepts a comma-separated list. Expand options include: * `*all` Returns all fields. * `*navigable` Returns navigable fields. * Any issue field, prefixed with a minus to exclude. Examples: * `summary,comment` Returns only the summary and comments fields. * `-description` Returns all navigable (default) fields except description. * `*all,-comment` Returns all fields except comments. This parameter may be specified multiple times. For example, `fields=field1,field2&fields=field3`. Note: All navigable fields are returned by default. This differs from [GET issue](#api-rest-api-3-issue-issueIdOrKey-get) where the default is all fields.

Use [expand](#expansion) to include additional information about issues in the response. This parameter accepts a comma-separated list. Expand options include: * `renderedFields` Returns field values rendered in HTML format. * `names` Returns the display name of each field. * `schema` Returns the schema describing a field type. * `transitions` Returns all possible transitions for the issue. * `operations` Returns all possible operations for the issue. * `editmeta` Returns information about how each field can be edited. * `changelog` Returns a list of recent updates to an issue, sorted by date, starting from the most recent. * `versionedRepresentations` Instead of `fields`, returns `versionedRepresentations` a JSON array containing each version of a field's value, with the highest numbered item representing the most recent version.

A list of issue property keys for issue properties to include in the results. This parameter accepts a comma-separated list. Multiple properties can also be provided using an ampersand separated list. For example, `properties=prop1,prop2&properties=prop3`. A maximum of 5 issue property keys can be specified.

Reference fields by their key (rather than ID).

Whether to fail the request quickly in case of an error while loading fields for an issue. For `failFast=true`, if one field fails, the entire operation fails. For `failFast=false`, the operation will continue even if a field fails. It will return a valid response, but without values for the failed field(s).