docNum
. Once a document is deleted it will not appear in TermDocs or TermPostitions enumerations. Attempts to read its field with the {@link #document}method will result in an error. The presence of this document may still be reflected in the {@link #docFreq} statistic, thoughthis will be corrected eventually as the index is further modified.
@throws StaleReaderException if the index has changedsince this reader was opened
@throws CorruptIndexException if the index is corrupt
@throws LockObtainFailedException if another writerhas this index open (write.lock
could not be obtained)
@throws IOException if there is a low-level IO error
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