How do I enable stemming in Elasticsearch?

How do I enable stemming in Elasticsearch?

curl -XPUT "localhost:9200/products" -d '{
"settings": {
"index": {
"number_of_replicas" : 0,
"number_of_shards": 1
}
},
"mappings": {
"products": {
"properties": {
"location" : {
"type" : "geo_point"
}
}
}
}
}'
I currently have a bash script that creates my index. Code is above.
How do I add stemming to it?