's', 'so', 'som', 'some', 'some ', 'some s' etc.

analysis: {
  analyzer: {
    autoComplete: {
      filter: [
        "lowercase"
      ],
      type: "custom",
      tokenizer: "autoComplete"
    },
    caseInsensitive: {
      type: "custom",
      filter: [
        "lowercase"
      ],
      tokenizer: "keyword"
    }
  },
  tokenizer: {
    autoComplete: {
      type: "nGram",
      min_gram: "1",
      max_gram: "40"
    }
  }
},