I moved "copy_to":"product_all" inside label.label of mutifield. Now it works
"label": { "type": "multi_field", "fields": { "label": { "type": "string", "copy_to": "product_all" "index_analyzer": "productAnalyzer", "search_analyzer": "productAnalyzer" }, "raw": { "type": "string", "index": "not_analyzed" } } }