Empty field in document takes up space in elasticsearch?
1 answer
If you keep the default settings, the original document is saved in the _ source field , there will be a difference since the original document of case A is larger than case B.
Otherwise, there should be no difference: for case A, no term is added to the index for the color field because it is empty.
You can use the _size field to see the size of the indexed source document, which is the size of the _source field:
POST stack
{
"mappings":{
"features":{
"_size": {"enabled":true, "store":true},
"properties":{
"price":{
"type":"byte"
},
"colors":{
"type":"string"
}
}
}
}
}
PUT stack/features/1
{
"price": 1
}
PUT stack/features/2
{
"price": 1,
"colors": []
}
POST stack/features/_search
{
"fields": [
"_size"
]
}
The last query will print this result, which shows that document 2 takes up more space than document 1:
{
"took": 1,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"failed": 0
},
"hits": {
"total": 2,
"max_score": 1,
"hits": [
{
"_index": "stack",
"_type": "features",
"_id": "1",
"_score": 1,
"fields": {
"_size": 16
}
},
{
"_index": "stack",
"_type": "features",
"_id": "2",
"_score": 1,
"fields": {
"_size": 32
}
}
]
}
}
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