NihmsPassClientService.findJournalByIssn uses incorrect attribute

[emetsger]

NihmsPassClientService.findJournalByIssn attempts to find a Journal by ISSN, but uses the incorrect ES attribute issn. Instead, issns (plural) should be used.

An initial assessment indicates this should be corrected:

• This method (see screenshot) appears to be called by production code.
• Because a Journal may have multiple ISSNs, the method logic probably needs to be updated to account for this

    /**
     * Look up Journal URI using ISSN
     * @param issn the issn
     * @return
     */
    public URI findJournalByIssn(String issn) {
        if (nullOrEmpty(issn)) {
            return null;      
        }
        return client.findByAttribute(Journal.class, "issn", issn);
    }