Use Case: Let's say, you already have an index on one Server1 and you want to create a new index with the exact structure on Server2. What you should do?
1. Copy the index structure from Server1. Let's say your index name is: product-data-index and you can access the settings here: https://x.x.x.x:9200/product-data-index/_settings
Now before creating an index, you have to remove few fields from the above JSON
and it should look like this.