Where can I locate the metric for total vector count per index?

Plugins Machine Learning
1

Versions (relevant - OpenSearch/Dashboard/Server OS/Browser): 2.13 AWS OpenSearch

Describe the issue:

I’d like to crunch some numbers to estimate memory usage for knn vectors (k-NN index - OpenSearch Documentation)

However, I can’t find stats for total vectors stored in an index anywhere. Index API and KNN Plugin API don’t seem to expose this metric.

ElasticSearch Index API, for example, does have “dense_vectors” metric: dense_vector
Total number of dense vectors indexed.

I’m looking for something similar in OpenSearch.

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