ProgressIndexer

This method allows an indexer the opportunity to modifiy the provided Lucene document (by reference) such that it will contain fields that are relevant for searching and storage of the portion of the issue that the FieldIndexer handles. If calling isFieldVisibleAndInScope(com.atlassian.jira.issue.Issue) returns false then this method should create fields that have an Indexed type of NO. This allows us to store the value in the index but renderes its value unsearchable. If, for example, the indexer handles indexing an issues summary then this indexer will add a field to the document that represents the stored and searchable summary of the issue.

This method is used to determine if the indexer is relevant for the provided issue. This method must check the fields visibility, in relation to the field configuration scheme, must check any global flags that would enable or disable a field (such as enable votes flag), and must check, if the field is a custom field, if the custom field is relevant for this issue. All these checks should take into account the IssueContext as defined by the passed in issue. If this method returns false then the FieldIndexer, when performing addIndex, should make sure to make the indexed values have an Indexed type of NO. The result of this method is used to determine the correct values that should be returned when performing an empty search.