{"msg":"exception","exception":{"type":3,"message":"org.apache.solr.client.solrj.impl.HttpSolrClient$RemoteSolrException: Error from server at https:\/\/index-6.usw2.infovell.com:8983\/solr\/solr-search: org.apache.solr.search.SyntaxError: Cannot parse '(journal_doi:()) AND internal_data_source:(unpaywall OR pubmed OR crossref OR pmc)': Encountered \" \")\" \") \"\" at line 1, column 14.\nWas expecting one of:\n ...\n \"+\" ...\n \"-\" ...\n ...\n \"(\" ...\n \"*\" ...\n ...\n ...\n ...\n ...\n ...\n \"[\" ...\n \"{\" ...\n ...\n \"filter(\" ...\n ...\n ...\n ","debugInfo":null}}