Update indexes only when needed

// put in cache a value with 2 field, one indexed and one not indexed.
Value value = new Value();
value.setNonIndexedFieldValue(123);
value.setIndexedFieldValue(456);
cache.put("key", value);

// later...
// get back value from cache and update the not indexed field
Value value = cache.get("key");
value.setNonIndexedFieldValue(789);
cache.put("key", value);

The second put operation will trigger index to update even tough it hasn't changed.

Sanne suggested :
" Thinking about it, there might be some situations in which we can detect it, for example if the put is going to carry a valid return value then we could compare values in string form.. nice, please open an improvement request on JIRA!"

See https://community.jboss.org/thread/195303 for complete reference