Documentation for JIRA 5.2. Documentation for other versions of JIRA is available too. 
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JIRA's issue cloning behaviour can be modified by JIRA system administrators.
By default, when an issue is cloned, JIRA will automatically create a link between the original and cloned issue using the pre-existing link type name 'Cloners'.
You can change this default behaviour by editing the jira.clone.linktype.name property of your jira-config.properties file.
If this property does not exist in your
jira-config.properties file, add it to the file.
By default, the 'Summary' field of a cloned issue is prefixed with the string 'CLONE - ' to indicate that the issue is a clone.
To change this prefix or prevent the addition of prefixes on cloned issues:
jira.clone.prefix property by clicking the existing value and specifying a different prefix for the 'Summary' field of cloned issues.