Unknown key for a START_ARRAY in [fields]. in elasticsearch

Question

I have been trying to get the specific fields data from the index that is been provided but getting the error "Unknown key for a START_ARRAY in [fields]".

Unknown key for a START_ARRAY in [fields].

fields: ['snippet.publishedAt']

my expected output out is it should provide the fields array in the hits

Val · Accepted Answer · 2021-08-05 07:10:47Z

35

You should be using stored_fields or _source instead of fields, i.e.

stored_fields: ['snippet.publishedAt']

or

_source: ['snippet.publishedAt']

UPDATE:

From 7.10 onwards, a new fields features is now available.

edited Aug 5, 2021 at 7:10

answered Feb 12, 2019 at 9:50

Val

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1 Comment

martsraits Over a year ago

Elastic 7.10 introduced new Fields feature. One can use this feature now to retrieve specific fields and the error in question should not occur.

robvankeilegom · Accepted Answer · 2019-09-30 09:58:59Z

5

For ES7.3 (current version as writing) you can pass a _source field which can contain a comma separated list of fields.

_source: 'snippet.publishedAt'

You can read more about this here

answered Sep 30, 2019 at 9:58

robvankeilegom

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