Get error when I try to query elasticsearch 6.2.4

OpenSearch Dashboards
1

v 2.18.0 opensearch and dashboard

I add a data source to an older Elasticsearch server 6.2.4
When I try to create an index of this external data source I get this error

Data Source Error: [index_not_found_exception] no such index, with { resource.type=“index_expression” & resource.id=“_resolve” & index_uuid=“na” & index=“_resolve” }

is this because the Elasticsearch is so old?
Are there any settings that can be adjusted?