This is an issue cased by the sync tool you use and Lucene Search engine. We have logged a task for investigating this case. The issue appears when you frequently update the index files. This happens when you update, create and delete pages/content items
You can avoid file locking by
Trigger the index on a certain period of time
- page index - there is an option (Sitefinity >> Administration >> Search) to set "Auto Index" to false
- for content types - this require to create a custom index and disable the auto index . You should create a custom class that inherits from ContentIndexProvider and override ContentProvider_Executed and you should not call the base, just leave the method empty. You can register the index in <indexClients> section of the web.config
- if possible remove App_Data/Search form sync and do this manually once or several times per day.
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