I have a dumb question, but I was wondering if I have a elasticsearch mappings with multiple fields in the property section of the mappings, then I send a document to elasticsearch, but the document is missing a few fields that are not in the mappings, this should not cause any issue correct? Thanks in advance guys 
It'll create a null value field
That may or may not be an issue for you though. Doing aggs on time based data will look weird.
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Thanks warkolm.