Ingest field configuration helper cache

[dtspence]

Implementation of a field helper cache using an LRU map.

• The cache can be optionally enabled on the BaseIngestHelper instance and will wrap an existing FieldConfigHelper implementation.
• By default the cache is disabled and must be enabled via configuration.

Closes #2612

[ivakegg]

Do we not need to limit the size of this cache?

[dtspence]

I think the map here will be limited to the size of the AttributeType (which was in the current class - maybe we should change the name). I tried an alternate version which used a switch statement on the enum and individual boolean variables, but it did not seem to impact the timing w/JMH. I will confirm the timing again - and we can also update to have a switch statement and explicit boolean results.

[dtspence]

An approach with a switch statement and primitive boolean variables was slightly quicker on second pass. I updated the logic, please let me know if we should evaluate the previous approach.

[dtspence]

Discussed additional performance ideas, going to run additional tests.

[jschmidt10]

Are we actually calling all these pairs?

You are iterating over an array of arrays but there's only 1 inner array with 12 elements in it.
It seems like we want 6 inner arrays, each with two elements {action, verify}
I think we're actually only testing the isIndexOnlyField pair here.

[jschmidt10]

It also has me wondering if maybe it's just easier to do the manual calls in the test instead of dealing with all the method references and such.

cachedHelper.isIndexOnlyField(fieldName);
verify(mockHelper).isIndexOnlyField(fieldName);

cachedHelper.isIndexedField(fieldName);
verify(mockHelper).isIndexedField(fieldName);

// ...

[dtspence]

That is a bug, thank you for catching that. In regards to the manual tests - I updated, thank you.