Elasticsearch 5.x.x cannot disable dynamic mapping - elasticsearch

Question

I'm trying to simply disable dynamic mapping for any fields not explicitly defined in the mapping at index creation time. Nothing would work, so I even tried the example in their docs
PUT my_index
{
"mappings": {
"my_type": {
"dynamic": false,
"properties": {
"user": {
"type": "text"
}
}
}
}
}
Made a test insert:
POST my_index/my_type
{
"user": "tester",
"some_unknown_field": "lsdkfjsd"
}
Then searching the index shows:
{
"took": 1,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"failed": 0
},
"hits": {
"total": 1,
"max_score": 1,
"hits": [
{
"_index": "my_index",
"_type": "my_type",
"_id": "AViPrfwVko8c8Q3co8Qz",
"_score": 1,
"_source": {
"user": "tester",
"some_unknown_field": "lsdkfjsd"
}
}
]
}
}
I'm expecting "some_unknown_field" to not be indexed, since it was not defined in the mapping. So why is it still being indexed? Am I missing something?
UPDATE
It turns out that it isn't currently possible in version 5.0.0 to do what I wanted, so I removed the fields in my app before sending to elasticsearch and achieved the same end result.

Answer 1

What mapping does is to have your field as the type which you mention, when you create the index using the mapping. So for a field which you haven't mentioned anything during the mapping and then trying to insert values, ES will always consider it as a new field and will add it to the index with a default mapping. So if you don't want to see a particular field within your _source you could do some source filtering.
Work arounds:
If that's not the case try disabling the default mapping when
you're creating the index.
Try making the property dynamic into strict:
PUT /test
{
"settings": {
"index.mapper.dynamic": false
},
"mappings": {
"testing_type": {
"dynamic":"strict",
"properties": {
"field1": {
"type": "string"
}
}
}
}
}
If the above two doesn't work out, try making index_mapper_dynamicto false. This SO could be handy. Hope it helps.