Expand search results to include, for example, all orthologs of all search results.

[mycrobe]

As a user I would like to be able to call a serach API enpoint and be returned all results and all orthologs of those results. The endpoint should have the same query parameter specification as /search but also require a parameter for the name of the field in the SOLR core with which to expand the search.

How the expand parameter would work:

• It must contain either a gene Id or an array of gene Ids (and/or, perhaps, a space-separated string of multiple gene ids)
• An initial search is performed using the paramters provided, as with the /search endpoint, except that only the id field is returned.
• A second search is performed for any gene where the specified expand parameter contains any id in the result set from the first search.
• If performant, results returned from the expand query should be modified to include the score from the initial query.

[ajo2995]

I don't think this is needed within the swagger server. It is possible to expand a search through another field with facet counting.

First, add a facet field to the query params

{
    'facet.field' : '{!facet.limit=-1 facet.mincount=1}' + facetFieldName,
    facet: true
}

When the results come back, convert the values into a new filter
facetFieldName + ':(' + values.join(' OR ') + ')'
N.B. values has to be populated from the facet_counts.facet_fields[facetFieldName] array which alternates between field values and counts