multiplexer error

curl -X DELETE "localhost:9200/companies"

curl -X PUT "localhost:9200/companies" -H 'Content-Type: application/json' -d'
{
  "settings": {
    "analysis": {
      "analyzer": {
        "company_name_analyzer": {
          "type":      "custom", 
          "tokenizer": "standard",
          "filter": ["company_name_filter"]
        }
      },
      "filter": {
        "company_name_filter": {
          "type": "multiplexer",
          "filters": [
            "company_name_camel_case, lowercase",
            "lowercase, company_name_abbreviations"
          ]
        },
        "company_name_abbreviations": {
          "type": "synonym_graph",
          "synonyms": ["co-op => cooperative", "corp,corporation"]
        },
        "company_name_camel_case": {
          "type": "word_delimiter_graph"
        }
      }
    }
  },
  "mappings": {
    "_doc": {
      "properties": {
        "company_name": {"type": "text", "analyzer": "company_name_analyzer"}
      }
    }
  }
}'

curl -X PUT "localhost:9200/companies/_doc/1" -H 'Content-Type: application/json' -d'
{
  "company_name" : "FedEx"
}'

On ES 6.8, this outputs:

{"error":{"root_cause":[{"type":"illegal_argument_exception","reason":"startOffset must be non-negative, and endOffset must be >= startOffset, and offsets must not go backwards startOffset=0,endOffset=5,lastStartOffset=3 for field 'company_name'"}],"type":"illegal_argument_exception","reason":"startOffset must be non-negative, and endOffset must be >= startOffset, and offsets must not go backwards startOffset=0,endOffset=5,lastStartOffset=3 for field 'company_name'"},"status":400}