[DOC] Missing documentation on Aggregations

[hdhalter]

What do you want to do?

Request a change to existing documentation

Tell us about your request. Provide a summary of the request and all versions that are affected. We have some documentation on aggregations, but we're missing some. Here is what we have https://opensearch.org/docs/latest/aggregations/. Here is what we're missing:

Metric aggregations

• [ ] Boxplot
• [ ] Geo-centriod
• [ ] Geo-line
• [ ] Median absolute deviation - https://github.com/opensearch-project/documentation-website/pull/6808
• [ ] Rate
• [ ] String stats
• [ ] Top metrics
• [ ] Weighted average

Bucket aggregations

• [ ] Auto-interval date histogram
• [ ] Categorize text
• [ ] Children
• [ ] Composite
• [ ] Diversified sampler
• [ ] Geotile grid
• [ ] Parent
• [ ] Rare terms
• [ ] Variable width histogram

Pipeline aggregations

• [ ] Bucket count K-S test
• [ ] Bucket correlation
• [ ] Cumulative cardinality
• [ ] Inference bucket
• [ ] Moving function
• [ ] Moving percentile
• [ ] Normalize
• [ ] Percentile bucket

What other resources are available? Provide links to related issues, POCs, steps for testing, etc.