Specifying search fields in search request

Elastic Stack Elasticsearch
1

Hi all,

I'm using ES version 0.90.7.

My requirement is to fetch all the fields of the JSON documents that I
search/filter for. Is there a performance difference in specifying all the
field names in the search request vs not specifying the 'fields' parameter.

By not specifying the fields parameter I see the response time to be
relatively faster.

Could someone explain this behavior?

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2

Each field given in search request adds up to search performance because
the field must be searched, weighted, scored, and ranked.

I recommend using _all field, or combining fields into fewer fields with
"copy_to", and use as few fields as possible for search.

Jörg

On Sun, Nov 23, 2014 at 10:56 AM, Ajay Divakaran <ajay.divakaran86@gmail.com

wrote:

Hi all,

I'm using ES version 0.90.7.

My requirement is to fetch all the fields of the JSON documents that I
search/filter for. Is there a performance difference in specifying all the
field names in the search request vs not specifying the 'fields' parameter.

By not specifying the fields parameter I see the response time to be
relatively faster.

Could someone explain this behavior?

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3

Jorg
Thanks for your reply.
Just to clarify the 'fields' that I was referring was for retrieval not against which to search.

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4

Jorg
Thanks for your reply.
Just to clarify the 'fields' that I was referring was for retrieval not against which to search.

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5

It all depends on how many fields and how big they are. Retrieving a few
specific fields might be faster in cases, but in general, each field is
another seek in Lucene. Values are not retrieved at the same time. If you
are going to get all the fields, just use the source.

--
Ivan

On Sun, Nov 23, 2014 at 10:15 AM, Ajay Divakaran <ajay.divakaran86@gmail.com

wrote:

Jorg
Thanks for your reply.
Just to clarify the 'fields' that I was referring was for retrieval not
against which to search.

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