Use IcatSynonymAnalyzer to write Documents

[patrick-austin]

When indexing, we were using a non-synonym version of the analyzer, but when searching synonyms were being injected. When doing basic OR logic queries (e.g. path to mr file) this is OK. The search term gets molecular replac injected, which isn't present in the Document but this is OK as it's an OR query.

When doing an phrase query (the most common use case for this is to quote an exact filepath, which will remove the / characters easily) each word has to match in order. At this point, there is no longer a match for the injected terms.

By using IcatSynonymAnalyzer for both, we can ensure that the injected term appear in both the search query and in the indexed Document we match against.

[ajkyffin]

This looks like a horrible thing to do (processing a file path for synonyms) but if it's the only way to get it to work then fine.

[patrick-austin]

I think you could use the add method instead of parse(reader), which would give you some freedom on where to source the synonym mappings. Ideally I wanted the synonyms to be configurable (e.g. if PaNET expands its ontology, I don't want that to be a source code change) but in reality I don't think DLS will really care enough to tailor the synonyms. If there's a more elegant way of achieving this you can think of, happy to do that in a future change.