Elasticsearch-Connector: can't index with Search-API Im using latest Drupal 8.x with Search-API 8.x-1.5 und Elasticsearch_Connector 8.x-5.0alpha1.

I can add a cluster and via Search API I can also connect to the Elasticsearch Server. But when I try to add an Index via Search API the following error comes up:

{"error":{"root_cause":[{"type":"mapper_parsing_exception","reason":"No handler for type [string] declared on field [id]"}],"type":"mapper_parsing_exception","reason":"No handler for type [string] declared on field [id]"},"status":400} 


Does anyone know of such an error and can help me with that?
Elasticsearch has deprecated the string type in 5.x versions, and is now using text or keyword. (see https://www.elastic.co/guide/en/elasticsearch/reference/5.5/string.html)

In /admin/config/search/search-api/&lt;CLUSTER&gt;/&lt;INDEX&gt;/fields, you may change string by text in ID field. Considering this is an integer -id-, you may choose the type integer.