searching in multiple languages using different analyzers

elasticsearch_mapping.sh

# Setup
curl -s -X DELETE 'http://localhost:9200/news_cs/'
curl -s -X DELETE 'http://localhost:9200/news_en/'

# Create Czech and English indices (databases)
curl -s -X PUT 'http://localhost:9200/news_cs/'
curl -s -X PUT 'http://localhost:9200/news_en/'

# Create mapping for Czech documents
curl -s -X PUT 'http://localhost:9200/news_cs/_mapping' -d '
{
    "message" : {
        "properties" : {
            "body" : {
                "type" : "multi_field",
                "fields" : {
                    "body" :  {"type" : "string", "index" : "analyzed", "analyzer" : "czech"},
                    "exact" : {"type" : "string", "index" : "analyzed", "analyzer" : "keyword"}
                }
            }
        }
    }
}'

# Create mapping for English documents
curl -s -X PUT 'http://localhost:9200/news_en/_mapping' -d '
{
    "message" : {
        "properties" : {
            "body" : {
                "type" : "multi_field",
                "fields" : {
                    "body" :  {"type" : "string", "index" : "analyzed", "analyzer" : "snowball"},
                    "exact" : {"type" : "string", "index" : "analyzed", "analyzer" : "keyword"}
                }
            }
        }
    }
}'

# Refresh indices
curl -s -X POST 'http://localhost:9200/news_cs/_refresh'
curl -s -X POST 'http://localhost:9200/news_en/_refresh'

# Create documents
curl -s -X POST 'http://localhost:9200/news_cs/message' -d '{"body":"stromeček"}'
curl -s -X POST 'http://localhost:9200/news_en/message' -d '{"body":"tree"}'
curl -s -X POST 'http://localhost:9200/news_cs/_refresh'
curl -s -X POST 'http://localhost:9200/news_en/_refresh'

# Create database "news" as an alias for "news_cs" and "news_en"
curl -s -X POST 'http://localhost:9200/_aliases' -d '
{
    "actions" : [
        { "add" : { "index" : "news_cs", "alias" : "news" } },
        { "add" : { "index" : "news_en", "alias" : "news" } }
    ]
}'

# Search for phrase in English documents
curl -s -X GET 'http://localhost:9200/news/_search?pretty=true&q=body:trees'
curl -s -X GET 'http://localhost:9200/news/_search?pretty=true&q=body:tree'

# Search for phrase in Czech documents
curl -s -X GET 'http://localhost:9200/news/_search?pretty=true&q=body:strome%C4%8Dek'
curl -s -X GET 'http://localhost:9200/news/_search?pretty=true&q=body:strome%C4%8Dky'

# Search for exact phrase in English documents
curl -s -X GET 'http://localhost:9200/news/_search?pretty=true&q=body.exact:trees'
curl -s -X GET 'http://localhost:9200/news/_search?pretty=true&q=body.exact:tree'

# Search for exact phrase in Czech documents
curl -s -X GET 'http://localhost:9200/news/_search?pretty=true&q=body.exact:strome%C4%8Dek'
curl -s -X GET 'http://localhost:9200/news/_search?pretty=true&q=body.exact:strome%C4%8Dky'