How can we use elasticsearch custom similarity plugin in mapping?

Elastic Stack Elasticsearch
1

Hi,

I need to override Lucene Default Similarity Class which is used by
Elasticsearch for indexing and searching. On searching net, I found some
similar implementations which are doing similar things. My difficulty is
that I have no idea of how to actually implement this in my code. I found
some resources:

curl -XPOST 'http://host:port/tweeter/' -d '{
"settings": {
"similarity": {
"index": {
"type": "org.elasticsearch.index.similarity.CustomSimilarityProvider"
},
"search": {
"type": "org.elasticsearch.index.similarity.CustomSimilarityProvider"
}
}
}}'

I'm not able to understand how can i use this line directly during indexing
so that my default similarity changes to this custom similarity.

org.elasticsearch.index.similarity.CustomSimilarityProvider

Can anyone please tell me how I can do this ? I tried running the same
thing on my machine but it's not working for me. Do I need to modify this
line or path ?

Thanks in advance.

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2

The plugin is outdated.

You can override similarity by standard ES 0.90+

http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/index-modules-similarity.html

Jörg

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3

I have read about that module but the thing is I have to set idf to 1.
Actually, I want common terms to give more weight in my search. Now, when I
googled about it, it says overriding the default similarity class is the
only way to achieve it. That's the reason why I'm looking for these plugins.

On Wed, Jan 15, 2014 at 10:35 PM, joergprante@gmail.com <
joergprante@gmail.com> wrote:

The plugin is outdated.

You can override similarity by standard ES 0.90+

Elasticsearch Platform — Find real-time answers at scale | Elastic

Jörg

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4

I have looked into that similarity plugin in the past and as far as I can
tell, it is partially wrong. Judging by the elasticsearch code, there is no
way to change the similarity depending if you are indexing or querying. The
similarity is simply tied to a field and it is used at all times. Someone
please correct me if I am wrong.

Besides that, writing your own similarity plugin is simple. You just need
one class extending AbstractSimilarityProvider and another class with the
actual similarity, which probably extends DefaultSimilarity. No need for a
plugin, you just need the classes in the elasticsearch classpath at startup.

Cheers,

Ivan

On Wed, Jan 15, 2014 at 9:17 AM, Mukul Gupta mukulnitkkr@gmail.com wrote:

I have read about that module but the thing is I have to set idf to 1.
Actually, I want common terms to give more weight in my search. Now, when I
googled about it, it says overriding the default similarity class is the
only way to achieve it. That's the reason why I'm looking for these plugins.

On Wed, Jan 15, 2014 at 10:35 PM, joergprante@gmail.com <
joergprante@gmail.com> wrote:

The plugin is outdated.

You can override similarity by standard ES 0.90+

Elasticsearch Platform — Find real-time answers at scale | Elastic

Jörg

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5

Why don't you use function score if you only want to tweak parameters?

http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/query-dsl-function-score-query.html

Changing similarity is a massive change, it's exchanging the whole
algorithm. Not recommended unless you can't get what you want from function
score.

Jörg

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6

I was focused on how to use a custom similarity and not how to actually
tackle the problem. In this respect, I agree with Jörg. Also, I believe the
today's release (1.0.0.RC1) has additional scripting options:

Cheers,

Ivan

On Wed, Jan 15, 2014 at 10:53 AM, joergprante@gmail.com <
joergprante@gmail.com> wrote:

Why don't you use function score if you only want to tweak parameters?

Elasticsearch Platform — Find real-time answers at scale | Elastic

Changing similarity is a massive change, it's exchanging the whole
algorithm. Not recommended unless you can't get what you want from function
score.

Jörg

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7

Hi Ivan,

Can you please tell me how can I add the above mentioned classes in my
elasticsearch classpath ?

Thanks

On Wed, Jan 15, 2014 at 11:22 PM, Ivan Brusic ivan@brusic.com wrote:

I have looked into that similarity plugin in the past and as far as I can
tell, it is partially wrong. Judging by the elasticsearch code, there is no
way to change the similarity depending if you are indexing or querying. The
similarity is simply tied to a field and it is used at all times. Someone
please correct me if I am wrong.

Besides that, writing your own similarity plugin is simple. You just need
one class extending AbstractSimilarityProvider and another class with the
actual similarity, which probably extends DefaultSimilarity. No need for a
plugin, you just need the classes in the elasticsearch classpath at startup.

Cheers,

Ivan

On Wed, Jan 15, 2014 at 9:17 AM, Mukul Gupta mukulnitkkr@gmail.comwrote:

I have read about that module but the thing is I have to set idf to 1.
Actually, I want common terms to give more weight in my search. Now, when I
googled about it, it says overriding the default similarity class is the
only way to achieve it. That's the reason why I'm looking for these plugins.

On Wed, Jan 15, 2014 at 10:35 PM, joergprante@gmail.com <
joergprante@gmail.com> wrote:

The plugin is outdated.

You can override similarity by standard ES 0.90+

Elasticsearch Platform — Find real-time answers at scale | Elastic

Jörg

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8

Hi Jörg,

Let's say I want to modify my _score in such a way that it doesn't take
into consideration idf while calculating score. How can I achieve this
using function score ? Can you give me some example usage of function score
which takes only tf into consideration.

Thanks

On Thu, Jan 16, 2014 at 12:23 AM, joergprante@gmail.com <
joergprante@gmail.com> wrote:

Why don't you use function score if you only want to tweak parameters?

Elasticsearch Platform — Find real-time answers at scale | Elastic

Changing similarity is a massive change, it's exchanging the whole
algorithm. Not recommended unless you can't get what you want from function
score.

Jörg

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9

I don't know how to do this by function score, but have you looked at it?

Jörg

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10

Using the function_score you could use a script. Since 0.90.10 you can
access term statistics from a script
(Add support for using payloads to boost terms · Issue #3772 · elastic/elasticsearch · GitHub), term
frequency included. You could for instance emit your own score that takes
into account only the term frequency but not the idf.

On Thursday, January 16, 2014 9:18:57 AM UTC+1, Jörg Prante wrote:

I don't know how to do this by function score, but have you looked at it?

Jörg

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11

Is there any java api available for function_score ?

On Thu, Jan 16, 2014 at 5:16 PM, Luca Cavanna cavannaluca@gmail.com wrote:

Using the function_score you could use a script. Since 0.90.10 you can
access term statistics from a script (
Add support for using payloads to boost terms · Issue #3772 · elastic/elasticsearch · GitHub), term
frequency included. You could for instance emit your own score that takes
into account only the term frequency but not the idf.

On Thursday, January 16, 2014 9:18:57 AM UTC+1, Jörg Prante wrote:

I don't know how to do this by function score, but have you looked at it?

Jörg

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12

Not sure what you mean, the function score is a query that is part of the
query DSL. If you are using the java API, you can find the usual query
builder, called FunctionScoreQueryBuilder or even use the handy
QueryBuilders static methods to create one.

On Thu, Jan 16, 2014 at 1:43 PM, Mukul Gupta mukulnitkkr@gmail.com wrote:

Is there any java api available for function_score ?

On Thu, Jan 16, 2014 at 5:16 PM, Luca Cavanna cavannaluca@gmail.comwrote:

Using the function_score you could use a script. Since 0.90.10 you can
access term statistics from a script (
Add support for using payloads to boost terms · Issue #3772 · elastic/elasticsearch · GitHub), term
frequency included. You could for instance emit your own score that takes
into account only the term frequency but not the idf.

On Thursday, January 16, 2014 9:18:57 AM UTC+1, Jörg Prante wrote:

I don't know how to do this by function score, but have you looked at it?

Jörg

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13

I tried using FunctionScoreQueryBuilders but there is no such thing
available with me. Do I need to use any package for this ?

On Thu, Jan 16, 2014 at 6:26 PM, Luca Cavanna cavannaluca@gmail.com wrote:

Not sure what you mean, the function score is a query that is part of the
query DSL. If you are using the java API, you can find the usual query
builder, called FunctionScoreQueryBuilder or even use the handy
QueryBuilders static methods to create one.

On Thu, Jan 16, 2014 at 1:43 PM, Mukul Gupta mukulnitkkr@gmail.comwrote:

Is there any java api available for function_score ?

On Thu, Jan 16, 2014 at 5:16 PM, Luca Cavanna cavannaluca@gmail.comwrote:

Using the function_score you could use a script. Since 0.90.10 you can
access term statistics from a script (
Add support for using payloads to boost terms · Issue #3772 · elastic/elasticsearch · GitHub), term
frequency included. You could for instance emit your own score that takes
into account only the term frequency but not the idf.

On Thursday, January 16, 2014 9:18:57 AM UTC+1, Jörg Prante wrote:

I don't know how to do this by function score, but have you looked at
it?

Jörg

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14

I guess you are using a not so recent version of elasticsearch then. Which
version are you working on?

On Thu, Jan 16, 2014 at 2:21 PM, Mukul Gupta mukulnitkkr@gmail.com wrote:

I tried using FunctionScoreQueryBuilders but there is no such thing
available with me. Do I need to use any package for this ?

On Thu, Jan 16, 2014 at 6:26 PM, Luca Cavanna cavannaluca@gmail.comwrote:

Not sure what you mean, the function score is a query that is part of the
query DSL. If you are using the java API, you can find the usual query
builder, called FunctionScoreQueryBuilder or even use the handy
QueryBuilders static methods to create one.

On Thu, Jan 16, 2014 at 1:43 PM, Mukul Gupta mukulnitkkr@gmail.comwrote:

Is there any java api available for function_score ?

On Thu, Jan 16, 2014 at 5:16 PM, Luca Cavanna cavannaluca@gmail.comwrote:

Using the function_score you could use a script. Since 0.90.10 you can
access term statistics from a script (
Add support for using payloads to boost terms · Issue #3772 · elastic/elasticsearch · GitHub), term
frequency included. You could for instance emit your own score that takes
into account only the term frequency but not the idf.

On Thursday, January 16, 2014 9:18:57 AM UTC+1, Jörg Prante wrote:

I don't know how to do this by function score, but have you looked at
it?

Jörg

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15

My bad. I'm using elasticsearch-0.90.3. I guess it's not available in this
version.

On Thu, Jan 16, 2014 at 6:56 PM, Luca Cavanna cavannaluca@gmail.com wrote:

I guess you are using a not so recent version of elasticsearch then. Which
version are you working on?

On Thu, Jan 16, 2014 at 2:21 PM, Mukul Gupta mukulnitkkr@gmail.comwrote:

I tried using FunctionScoreQueryBuilders but there is no such thing
available with me. Do I need to use any package for this ?

On Thu, Jan 16, 2014 at 6:26 PM, Luca Cavanna cavannaluca@gmail.comwrote:

Not sure what you mean, the function score is a query that is part of
the query DSL. If you are using the java API, you can find the usual query
builder, called FunctionScoreQueryBuilder or even use the handy
QueryBuilders static methods to create one.

On Thu, Jan 16, 2014 at 1:43 PM, Mukul Gupta mukulnitkkr@gmail.comwrote:

Is there any java api available for function_score ?

On Thu, Jan 16, 2014 at 5:16 PM, Luca Cavanna cavannaluca@gmail.comwrote:

Using the function_score you could use a script. Since 0.90.10 you can
access term statistics from a script (
Add support for using payloads to boost terms · Issue #3772 · elastic/elasticsearch · GitHub), term
frequency included. You could for instance emit your own score that takes
into account only the term frequency but not the idf.

On Thursday, January 16, 2014 9:18:57 AM UTC+1, Jörg Prante wrote:

I don't know how to do this by function score, but have you looked at
it?

Jörg

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