Hi there,

while trying to use

properties.put(Environment.INDEX_UNINVERTING_ALLOWED, true);

I have discovered that
org.hibernate.search.util.configuration.impl.ConfigurationParseHelper#getBooleanValue
uses Properties.getProperty which returns null when the property value is not a string.

In my case, this has the effect that using a boolean "true" INDEX_UNINVERTING_ALLOWED is not recognized and an exception is thrown instead as this is now the default. Using a string based "true" works as expected.

IMHO, this is a pitfall that could be easily avoided by also allowing boolean values.