I am using hibernate-search,and I want to use the
FullTextQuery.setProject(String... fields);
And these fields must be store.yes,also I do not want to hard-code these fields,so I wonder if there is any way to tell me which field are set as index.yes?

No, that is currently not possible. It would fall under HSEARCH-436.

--Hardy

SO,how does the hibernate-search know which Entity and which field is indexed?

If you are talking about projection then Hibernate Search does not know either. Search is not validating the projection field names you are providing. It is your responsibility to provide the right names. The mentioned Jira issue would be a first step into being able to have some validation. On the other hand you might be using custom field/class bridges where Search could not know/verify which fields you are adding to the index.

--Hardy