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https://issues.apache.org/jira/browse/JAMES-2078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16941530#comment-16941530
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Benoit Tellier commented on JAMES-2078:
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https://github.com/linagora/james-project/pull/2726 highlighted bugs caused by
dynamic mapping usage.
> disable dynamic parsing in our mapping and changing header structure
> --------------------------------------------------------------------
>
> Key: JAMES-2078
> URL: https://issues.apache.org/jira/browse/JAMES-2078
> Project: James Server
> Issue Type: Improvement
> Components: elasticsearch
> Reporter: Luc DUZAN
> Priority: Major
>
> We should turn off dynamic mapping
> (https://www.elastic.co/guide/en/elasticsearch/reference/2.2/dynamic-field-mapping.html).
> Dynamic mapping allow ES to automatically guess the type of a field when it
> indexes a document with a field not described by the mapping. He will also
> automatically create a index for it. This have two issues:
> * Creating to much index and moreover creating parse index. This will slow
> down write time
> * Guessing wrong type. Imagine the first time ES receives an unknown field
> with a number, he will update the mapping and specify this field should be a
> number. If this is wrong and a new document arrive with this field but with a
> String, the indexation of this document will fail!
> After changing the mapping to dynamic, we will have an issue when indexing.
> For the moment the header are stored in the following format inside ES: {
> headers: { header1: value1, header2: value2}}.
> If we keep this format with dynamic: false, header won't be search-able
> because they will have no mapping.
> To avoid this issue we will we change the format of the message to: {
> headers: [{key: "header1", value: "value1"}, {key: "header2", value:
> "value2"}]}
> This can be express in the mapping with help of "nested":
> https://www.elastic.co/guide/en/elasticsearch/reference/2.2/nested.html.
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