elasticsearch/docs/reference/query-languages/esql/kibana/docs/functions/byte_length.md

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BYTE LENGTH

Returns the byte length of a string.

Note: All strings are in UTF-8, so a single character can use multiple bytes.

FROM airports
| WHERE country == "India"
| KEEP city
| EVAL fn_length = LENGTH(city), fn_byte_length = BYTE_LENGTH(city)