[failed to parse search source. unknown search element [mappings]]

Elastic Stack Elasticsearch
5

Thank you! I get this new error now -

{"error":{"root_cause":[{"type":"index_already_exists_exception","reason":"already exists","index":"appindex"}],"type":"index_already_exists_exception","reason":"already exists","index":"appindex"},"status":400}

This is my new curl command -

curl -X POST "http://localhost:9200/appindex" -d '{
  "mappings":{
     "appindex":{
        "_source":{
           "excludes":[
              "field_attachment_resource_name_base64"
           ]
        },
        "properties":{
           "field_attachment_resource_name_base64":{
              "type":"attachment",
              "fields":{
                 "content":{
                    "type":"string",
                    "store":true
                 }
              }
           },
           "name":{
              "type":"string"
           }
        }
     }
  }
}'