Preferably the team lead candidate has prior team lead experience working in Singapore, as the working culture differs in Singapore vs offshore delivery centers.
Expectation of SG customers in a SI environment varies very much from supporting overseas/American/European customers from offshore delivery centers.
Key criteria should be in leading a team of operations engineers which extends beyond Elastic (Observability domain), not a team lead for being a L3/L4 in the observability domain, though it will be good if the candidate has some prior experience supporting observability tooling.
From technology standpoint, the team lead will have SMEs in each technology stack to support him/her. i.e. he does not need be master in the whole technology stack.