[ES|QL] Make SubstituteSurrogateExpressions recognize SurrogateExpression attached to MultiTypeEsField #126645
Description
#126532 Introduces surrogate expressions for to_ip (conversion)function. Traditionally, the substitute surrogate expressions is done by LogicalPlanOptimizer's substitutions batch. Because SubstituteSurrogateExpressions cannot recognize the conversion/surrogate functions attached to MultiTypeEsField today, the substitution of to_ip for multi-typed fields is done in Analyzer.
This issue is open to investigate the possibility to improve SubstituteSurrogateExpressions to recognize the conversion/surrogate functions attached to MultiTypeEsField, so that the substitutions can be centralized in LogicalPlanOptimizer