ES|QL string functions

ES|QL supports these string functions:

BIT_LENGTH
Returns the bit length of a string.
BYTE_LENGTH
Returns the byte length of a string.
CHUNK
Splits a text field into smaller chunks.
CONCAT
Concatenates two or more strings.
CONTAINS
Checks whether a keyword substring is contained within another string.
ENDS_WITH
Checks whether a keyword string ends with another string.
FROM_BASE64
Decodes a base64 string.
HASH
Computes the hash of the input using a specified algorithm.
JSON_EXTRACT
Extracts a value from a JSON string using JSONPath syntax.
LEFT
Returns a substring of the specified length from the left side of a string.
LENGTH
Returns the character length of a string.
LOCATE
Returns the position of a keyword substring within another string.
LTRIM
Removes leading whitespaces from a string.
MD5
Computes the MD5 hash of the input.
REPEAT
Returns a string repeated a specified number of times.
REPLACE
Replaces regular expression matches in a string with a replacement string.
REVERSE
Returns the input string in reverse order.
RIGHT
Returns a substring of the specified length from the right side of a string.
RTRIM
Removes trailing whitespaces from a string.
SHA1
Computes the SHA1 hash of the input.
SHA256
Computes the SHA256 hash of the input.
SPACE
Returns a string made of the specified number of spaces.
SPLIT
Splits a single valued string into multiple strings.
STARTS_WITH
Checks whether a keyword string starts with another string.
SUBSTRING
Returns a substring of a string, specified by a start position and an optional length.
TO_BASE64
Encodes a string to a base64 string.
TO_LOWER
Returns a new string converted to lower case.
TO_UPPER
Returns a new string converted to upper case.
TRIM
Removes leading and trailing whitespaces from a string.
URL_DECODE
Decodes a URL-encoded string.
URL_ENCODE
URL-encodes a string with spaces encoded as plus signs.
URL_ENCODE_COMPONENT
URL-encodes a string with spaces encoded as percent codes.