removebuttons (#4133)

Signed-off-by: Heather Halter <hdhalter@amazon.com>

_im-plugin/index.md

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 # Managing indexes
-OpenSearch Dashboards
-{: .label .label-yellow :}
 
 You index data using the OpenSearch REST API. Two APIs exist: the index API and the `_bulk` API.
 

_im-plugin/ism/index.md

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 # Index State Management
-OpenSearch Dashboards
-{: .label .label-yellow :}
 
 If you analyze time-series data, you likely prioritize new data over old data. You might periodically perform certain operations on older indexes, such as reducing replica count or deleting them.
 

_observing-your-data/index.md

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 # Observability
-OpenSearch Dashboards
-{: .label .label-yellow :}
 
 Observability is collection of plugins and applications that let you visualize data-driven events by using Piped Processing Language to explore, discover, and query data stored in OpenSearch.