nebula 2.6.2 fulltext index function does not work well

[zhaochuanyun]

Describe the bug

When the full-text indexed field value contains Japanese json strings, the full-text index does not work properly, and the failed full-text index request will be retried infinitely to ES.

Your Environments (required)

nebula version: 2.6.2

ref: https://discuss.nebula-graph.com.cn/t/topic/7644

[rusonding]

+1

[cangfengzhs]

The problem is caused by incomplete truncation of the last utf8 character. To fix this, we need to recognize the encoding of the text and truncate at full characters.