Exclude source in Dense vector embedding increases the storage size

Plugins Machine Learning
,
1

Versions (relevant - OpenSearch/Dashboard/Server OS/Browser):
Opensearch- 3.2.0

Describe the issue:
Also the _source excludes if set in mappings is increasing the storage size by 2X.
Is this behavior expected or is this a bug?

Ex:

"mappings": {
  "_source": {
    "excludes": [
      "Description*"
    ]
  },
  "properties": {

increased the storage size for 9662 docs from 22mB to 53.7mB.

Could you please let me know your feddback,
Thanks in advance

2

@Navneet @dhrubo

3

+1, We are hitting the same problem. We have this use case where attachments are indexed using plugin and the original file need to be excluded from source. Hence our mapping contains the exclude with attachment. This causes the vector storage to double almost. Is there a configurable property that can honour exclude with vector storage?