Synonyms filter does not work correctly.

[paulpilone]

The SPARQL query to discover synonyms and like words is not correct. Also, we want to make sure that synonyms get the same operator and field as the originating term.

[paulpilone]

Using queries from #117 to fix this issue. The plan is load like terms during ontology ingest and save them in the terms index. At search time, we'll query the term index for an exact match and use the like words as part of our Elasticsearch query.

[paulpilone]

This is a big fix:

• Update the terms mapping to include alternate terms (e.g. synonyms, like words, alternate labels).
• Update the ingest code to handle indexing terms and their alternate terms.
• Update the search API to fetch alternate terms for a search keyword if the synonyms option is true.
• Update the search API to include alternate terms in the search document
• Ensure that the boolean operator and field are correctly applied to the alternate terms.