Opensearch adding new value to the old one

I have an opensearch and logstash stack; logstash sending logs from the base and i need to not just replace old values(that’s already works with method update in logstash and templates in opensearch), but adding new to the same field(something like concatenation).
Is it possible?

OpenSearch/OpenDistro are AWS run products and differ from the original Elasticsearch and Kibana products that Elastic builds and maintains. You may need to contact them directly for further assistance.

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