ES 5.6.10 default mapping field store Double and BigDecimal into string

Hi guys , i use XContentBuilder as a source of Index Request to store my biz data, like this
.field("table", Constants.ES_IDX_REPAYMENT)
.field("nation", repayment.getNation())
.field("amount", repayment.getAmount())
i find the BigDecimal property repayment.getAmount() saved into ES as a string type field , but this property saved into ES 6.7 version is number type field.
How to make up this issue?

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