tryUpdateDocValue

Expert: attempts to update doc values by document ID, as long as the provided reader is a near-real-time reader (from DirectoryReader.open). If the provided reader is an NRT reader obtained from this writer, and its segment has not been merged away, then the update succeeds and this method returns a valid (> 0) sequence number; else, it returns -1 and the caller must then either retry the update and resolve the document again. If a doc values fields data is null the existing value is removed from all documents matching the term. This can be used to un-delete a soft-deleted document since this method will apply the field update even if the document is marked as deleted.

NOTE: this method can only updates documents visible to the currently open NRT reader. If you need to update documents indexed after opening the NRT reader you must use .updateDocValues.