{"local":"OpenSearch 3.8 hybrid BM25 + dense neural index fed from the owned crawler corpus; Meilisearch is retained as fallback","default_external":{"general":["wikipedia","openalex","crossref"],"research":["crossref","wikipedia","openalex"],"news":["gdelt","wikipedia","openalex"],"books":["openlibrary","wikipedia","openalex"]},"optional":{"marginalia":"Enabled only when MARGINALIA_ENABLE=1 and a suitable API key is configured","commoncrawl":"Archive lookup/fetch fallback; not a general full-text index"}}