mergeOneFieldToIndex

Write the field for merging, providing a scorer over the newly merged flat vectors. This way any additional merging logic can be implemented by the user of this class.

Return

a scorer over the newly merged flat vectors, which should be closed as it holds a temporary file handle to read over the newly merged vectors

Parameters

fieldInfo

fieldInfo of the field to merge

mergeState

mergeState of the segments to merge

Throws

IOException

if an I/O error occurs when merging