static val IGNORE_INDEX: String
System property that instructs Spring to ignore the index, i.e. to always return null from #loadIndex(ClassLoader).
The default is "false", allowing for regular use of the index. Switching this flag to true fulfills a corner case scenario when an index is partially available for some libraries (or use cases) but couldn't be built for the whole application. In this case, the application context fallbacks to a regular classpath arrangement (i.e. as no index was present at all).