Elasticsearch conversion of string to keyword / text

Elastic Stack Elasticsearch
1

Can someone let me know what rules do elasticsearch follows to map a string field to text/keyword when an elasticsearch cluster running 2.3 is upgraded to 5.6.16?

For example how will the below string properties map to text/keyword?

{
        "properties": {
          "name" : {
            "type" : "string",
            "fields" : {
              "lower" : {
                "type" : "string",
                "analyzer" : "raw_lowercase_analyzer"
              },
              "raw" : {
                "type" : "string",
                "index" : "not_analyzed",
                "ignore_above" : 10922,
                "eager_global_ordinals": true
              }
            }
          }
        }
      }```
2

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