Hi,
we have some other minor information that might help in debugging this error: We index the embeddings as nested fields and can reproduce the error with the following code: String q = "{!knn f=vector topK=20}[0.031046804..."; SolrQuery sq = new SolrQuery("{!cache=false}" + q); sq.addField("score"); // no error without the score field sq.setRows(14); // Defect document must be included in result sq.setSort("ID", ORDER.asc); // Order is not important, but ID is. No error e.g. with score final QueryRequest r = new QueryRequest(sq, METHOD.POST); SolrClient solrClient = SolRConnector.createServer(server); QueryResponse response = r.process(solrClient); We checked that the child document with the document id is present in the index.