Analysis files are files that are created by the crawler if the <writeAnalysisFiles> tag was set to true.

They show the preparation steps and help to check the quality of the index by showing exactly what is indexed.

Just set the <writeAnalysisFiles> tag to true.

After the crawler is finished, the analysis files are located in the index directory in the subdirectory new/analysis or index/analysis, depending on whether the search mask has already switched to the new index.