How to search for utf-8 special characters in elasticsearch?
Assuming you're using eg bash, then you have one too many backslashes:
curl -XGET 'http://localhost:9200/index/type/_search?pretty=1' -d ' {"query" : {"text" : { "_all" : "\u0159eky" }}}'{ "took" : 16, "timed_out" : false, "_shards" : { "total" : 5, "successful" : 5, "failed" : 0 }, "hits" : { "total" : 1, "max_score" : 0.10848885, "hits" : [ { "_index" : "index", "_type" : "type", "_id" : "1", "_score" : 0.10848885, "_source" : {"name" : "Vrba u řeky"} } ] }}