This article is related to Opster’s Check Up tool. The Check-Up is free, does not require any installation and helps users improve performance in Elasticsearch and OpenSearch. Read more about it here, and run the tool here.
What it means
When you try to retrieve an Elasticsearch document by ID, Elasticsearch will count the number of times that a search or index operation searches for an ID which does not exist in the index. The most common cause for this is when an update or bulk update operation is trying to update a record with an ID which does not exist.
How to resolve
When you have a high index get missing total count, it is possible that your application architecture uses “upsert” as a strategy, i.e. updating a document if it exists and creating a new document if it doesn’t exist. In this case it is quite normal to have a high index get missing total count, and so this is expected behavior and there is no need to change anything.
If the amount of get misses is not too high, meaning in the perfectly normal range, it should not be considered an issue. However, when there is a high, consistent rate of get misses it might indicate that there is some application logic that should be optimized and reviewed. A high rate of index misses can cause indexing performance degradation.
As an edge case, if your system architecture expects the document being updated to always exist, then a high number here indicates that clients are trying to update documents that haven’t been indexed previously, so it is possible that indexing operations have failed or not run at all. In this case, it is worthwhile investigating the cause and taking action to capture failed indexing commands and have a system to retry indexing failures.
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