Why is this an issue?

Controls whether the search performs a contains query (if set to true) or a greater than query (if set to the default value false). Contains searches are less efficient than greater than or other query operators. This is because of the contains filter. The search tool needs to read the entire content of all records searched to find a solution which makes this action heavier for the instance.

Best practices

It is recommended that you leave this system property set to false.