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https://issues.apache.org/jira/browse/METAMODEL-84?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14161678#comment-14161678
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Kasper Sørensen commented on METAMODEL-84:
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1) I don't think this will be a risk. For each Document object in the ES API we 
can simply call "getDocumentID()". We do not have to know the physical name.

2) I would go for a STRING type simply.

> Include Document ID (as "_id") in ElasticSearch tables
> ------------------------------------------------------
>
>                 Key: METAMODEL-84
>                 URL: https://issues.apache.org/jira/browse/METAMODEL-84
>             Project: Metamodel
>          Issue Type: Improvement
>            Reporter: Kasper Sørensen
>
> I have been trying out the new ElasticSearch module a bit more now ...
> One requirement I would add is: It would be very nice to have the Document 
> IDs represented in our table model. The Document IDs can act as primary keys 
> which makes it much easier to identify records in the table. It also makes 
> sense from a performance point of view since ElasticSearch has a 
> high-performance way of doing a document-lookup based on doc ID. We could 
> thus implement the executePrimaryKeyLookupQuery(...) method in 
> ElasticSearchDataContext and offer such a quick lookup optimization,



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