Elasticsearch mapping select all fields via template to change their data type Elasticsearch - elasticsearch

Question

Hi All I am using elasticsearch-template.json to set data type of all of my fields to string. Below is the snippet of the template:
{
"template": "logstash-*",
"settings": {
"index.refresh_interval": "5s",
"number_of_shards": 1,
"number_of_replicas": 0
},
"mappings": {
"logs": {
"_all": {
"enabled": true
},
"properties": {
"level1": {
"properties": {
"level2": {
"properties": {
"_all": {"type": "string"}
}
}
}
}
}
}
}
}
Here under level2 i have got lots of fields which get created i want to set all of them to string how can i set it. I have tried "*" character as well as "%" character to select all the fields. but unfortunately it only gets added as a new field to the mapping. How to specify in template to select all the fields under a certain level?

Answer 1

I believe what you are looking for is a dynamic_templates and using path_match instead of match. This demonstrates how that might work:
curl -DELETE localhost:9200/test-*
curl -XDELETE http://localhost:9200/_template/test
curl -XPOST http://localhost:9200/_template/test -d '
{
"template": "test-*",
"mappings": {
"_default_": {
"dynamic_templates": [
{
"level1_level2_all": {
"path_match": "level1.level2.*",
"match_mapping_type": "*",
"mapping": {
"index": "not_analyzed",
"type": "string"
}
}
}
]
}
}
}
'
curl -XPOST http://localhost:9200/test-1/a -d '
{
"level1": {
"level2": {
"x":1
}
}
}'
curl -XPOST http://localhost:9200/test-1/a -d '
{
"level1": {
"level2": {
"y":1
}
}
}'
curl http://localhost:9200/test-1/_mapping?pretty
The output of which is:
"test-1" : {
"mappings" : {
"_default_" : {
"dynamic_templates" : [ {
"level1_level2_all" : {
"mapping" : {
"index" : "not_analyzed",
"type" : "string"
},
"match_mapping_type" : "*",
"path_match" : "level1.level2.*"
}
} ],
"properties" : { }
},
"a" : {
"dynamic_templates" : [ {
"level1_level2_all" : {
"mapping" : {
"index" : "not_analyzed",
"type" : "string"
},
"match_mapping_type" : "*",
"path_match" : "level1.level2.*"
}
} ],
"properties" : {
"level1" : {
"properties" : {
"level2" : {
"properties" : {
"x" : {
"type" : "string",
"index" : "not_analyzed"
},
"y" : {
"type" : "string",
"index" : "not_analyzed"
}
}
}
}
}
}
}
}
}
}