Avoid the impact of search errors during index creation

The Lucene index file on the company's website is automatically generated every day. Of course, this is also because of the need. This morning, we found a problem: an index error occurred during the generation process, the direct consequence is that the search content is almost empty!
So how can we avoid a similar problem? I used to set the index file location and the index file location during search to two directories.
For example, when an index is generated: The index is generated to the index_bak directory.
Use the index file under the index directory during search
ProgramThe running process is as follows:
1. Determine whether index_bak exists. Otherwise, create
2. generate an index file in the index_bak directory. If any error occurs, return false and record the log.
3. If there is no error, delete the original index under the index directory.
4. Change the index_bak name to index.

This is the above method. If you have a better solution, please let us know.