Implementing multiple synonym_path for single index in elastic search

I am trying to achieve multiple synonym_path for a single index in elasticsearch.

"settings": {
"index": {
  "analysis": {
    "analyzer": {
      "synonym": {
        "tokenizer": "whitespace",
        "filter": ["synonym"]
      }
    },
    "filter": {
      "bool": {
          "should": [{
            "synonym": {
              "type": "synonym",
              "synonyms_path": "synonyms.txt",
              "ignore_case": true
            }},
          {
            "synonym": {
              "type": "synonym",
              "synonyms_path": "synonyms2.txt",
              "ignore_case": true
          }}]
      }
    }
  }
}
},
  "mappings": {
    "animals": {
      "properties": {
        "name": {
          "type": "String",
          "analyzer": "synonym"
        }
      }
    }
  }

I tried the snippet above using JSON Sense in Chrome but it generated a TokenFilter [bool] must have a type associated with it error.

Is there other way to implement it?

The filter section in the analysis section is not meant to contain the Query DSL but token filter definitions.

In your case, you need to re-create your index with the following settings:

{
  "settings": {
    "index": {
      "analysis": {
        "analyzer": {
          "synonyms": {
            "tokenizer": "whitespace",
            "filter": [
              "synonym1",
              "synonym2"
            ]
          }
        },
        "filter": {
            "synonym1": {
              "type": "synonym",
              "synonyms_path": "synonyms.txt",
              "ignore_case": true
            },
            "synonym2": {
              "type": "synonym",
              "synonyms_path": "synonyms2.txt",
              "ignore_case": true
            }
        }
      }
    }
  },
  "mappings": {
    "animals": {
      "properties": {
        "name": {
          "type": "string",
          "analyzer": "synonyms"
        }
      }
    }
  }
}