question: synchronized String segString ( Iterable < SegmentCommitInfo > infos ) { final StringBuilder buffer = new StringBuilder ( ) ; for ( final SegmentCommitInfo info : infos ) { if ( buffer . length ( ) > 0 ) { buffer . append ( ' ' ) ; } buffer . append ( segString ( info ) ) ; } return buffer . toString ( ) ; }
target:  Returns a string description of the specified segments, for debugging.