How to delete a field in elasticsearch 2.3.0? I am using sense to do my queries - elasticsearch

Question

I have inserted a new field wiki_collection and set its value to true in my document by using:
POST /pibtest1/_update_by_query
{
"script": {
"inline": "ctx._source.wiki_collection=true"
},
"query": {
"match": {
"url":"http%3A%2F%2Fwww.searchtechnologies.com%2Fbundles%2Fmodernizr%3Fv%3D7-yR01kdRVQ7W1RQzMBVKYLDhCt0itEATWHixfzE8Os1"
}
}
}
But now I want to delete this field. I am trying to do this:
POST /pibtest1/_update
{
"script" : "ctx._source.remove(\"wiki_collection\")"
}
But I am getting an error which says:
{
"error": {
"root_cause": [
{
"type": "invalid_type_name_exception",
"reason": "Document mapping type name can't start with '_'"
}
],
"type": "invalid_type_name_exception",
"reason": "Document mapping type name can't start with '_'"
},
"status": 400
}
Is there any other way to delete a field in elasticsearch?
Edit: I have updated by query:
POST /pibtest1/_update_by_query
{
"script": {
"inline": "ctx._source.remove(\"wiki_collection\")"
},
"query": {
"match": {
"url": "http://www.searchtechnologies.com/bundles/modernizr?v=7-yR01kdRVQ7W1RQzMBVKYLDhCt0itEATWHixfzE8Os1"
}
}
}
But now I am getting a new filed called "remove='wiki_collection'" in my documents which looks like this: http://i.stack.imgur.com/QvxIa.png
I want to remove/delete this wiki_collection field from my documents.

Answer 1

Your update is wrong. It should either be (you specify the complete path - index/type/ID):
POST /pibtest1/test/234/_update
{
"script": {
"inline": "ctx._source.remove(\"wiki_collection\")"
}
}
Or you use the same _update_by_query:
POST /pibtest1/_update_by_query
{
"script": {
"inline": "ctx._source.remove(\"wiki_collection\")"
},
"query": {
"match": {
"url": "whatever"
}
}
}