public IndexUpgrader(Directory dir, IndexWriterConfig iwc, boolean deletePriorCommits) {this.dir = dir;this.iwc = iwc;this.deletePriorCommits = deletePriorCommits;}

public IndexUpgrader ( Directory dir , IndexWriterConfig iwc , boolean deletePriorCommits ) { this . dir = dir ; this . iwc = iwc ; this . deletePriorCommits = deletePriorCommits ; }
public IndexUpgrader(Directory dir, IndexWriterConfig iwc, bool deletePriorCommits){this.dir = dir;this.iwc = iwc;this.deletePriorCommits = deletePriorCommits;}
