+* This example script  console script updates a watcher on an issue.

+* "All right, title and interest in this code snippet shall remain the exclusive intellectual property of Adaptavist Group Ltd and its affiliates. Customers with a valid ScriptRunner

+* license shall be granted a  non-exclusive, non-transferable, freely revocable right to use this code snippet only within their own instance of Atlassian products. This licensing notice cannot be removed or

+* amended and must be included in any circumstances where the code snippet is shared by You or a third party." 

+*/

+

+// Specify the key of the issue to add below

+def issueKey = "<IssueKeyHere>"

+

+// Add the account ID of the user to add as the watcher below as this will define the user in the collection format that the watchers field requires. 

+// Note as the watcher field is a collection you can specify a comma seperated list of account ID's to add more than one user as a watcher.

+["<accountIdHere>"].each { accountId ->

+

+// Make the rest call to update the issue and set the watcher using the *accountID* provided for the user.

+def result = post('/rest/api/2/issue/' + issueKey + '/watchers')

+.header('Content-Type', 'application/json')

+.body("\"${accountId}\"")

+.asString()

+