Foundatio.Repositories.Exceptions.QueryValidationException : FieldEquals cannot be used on field 'ip' because it is an analyzed text field with no .keyword sub-field. A TermQuery on an analyzed text field produces unexpected results because Elasticsearch stores lowercased tokens, not the original text. To fix this, either: - Use FieldContains() for full-text token matching - Add a .keyword sub-field to the field mapping in your index configuration: m.Text(p => p.Name(f => f.Property).Fields(f => f.Keyword(k => k.Name("keyword"))))