How to change similarity settings runtime?

spancer_ray · July 14, 2014, 4:11am

Hi Guys,

I set my similarity type to 'BM25' in elasticsearch.yml , using index.similarity.default.type: BM25.
But in my search case(searching across some indices), I have to use the default similarity type.
Can I set the similarity type runtime without restarting the ES cluster? Or using java api to make
settings take effect for specific indices or ES TransportClient?

I tried put settings in my java code while construct a TransportClient, using code like below:
ImmutableSettings.settingsBuilder().put("index.similarity.custom.type", "default").build();

tried ‘index.similarity.default.type’， but it seems both 'index.similarity.default.type' and 'index.similarity.custom.type' didn't take effect while global settings in elasticsearch.yml is set.

Can anyone help?

Thanks a lot,
Spancer

jprante · July 14, 2014, 7:00am

You can not change the similarity module of an index during runtime.

Jörg

On Monday, July 14, 2014 6:11:44 AM UTC+2, spancer ray wrote:

Hi Guys,

I set my similarity type to 'BM25' in elasticsearch.yml , using
index.similarity.default.type: BM25.
But in my search case(searching across some indices), I have to use the
default similarity type.
Can I set the similarity type runtime without restarting the ES cluster?
Or
using java api to make
settings take effect for specific indices or ES TransportClient?

I tried put settings in my java code while construct a TransportClient,
using code like below:
ImmutableSettings.settingsBuilder().put("index.similarity.custom.type",
"default").build();

tried ‘index.similarity.default.type’， but it seems both
'index.similarity.default.type' and 'index.similarity.custom.type' didn't
take effect while global settings in elasticsearch.yml is set.

Can anyone help?

Thanks a lot,
Spancer

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Ivan · July 14, 2014, 6:17pm

Jörg is correct. In general, it would be a bad idea to change the
similarity during runtime, but there are cases were it would be acceptable
and the system should allow for those cases:

github.com/elastic/elasticsearch

Merging similarities

opened 06:46PM - 10 Dec 13 UTC

closed 11:46AM - 22 Jul 14 UTC

brusic

The current code [1] does not allow changing a field's similarity via a mapping …update. While it is true that changing a similarity after an index has been created will probably cause havoc on the scoring, developers should have the flexibility to shoot their own foot. :) If I were to submit a patch to allow a configurable override of the current behavior, what is the possibility that it would be accepted? Do not want to write code if it will be denied. [1] https://github.com/elasticsearch/elasticsearch/blob/master/src/main/java/org/elasticsearch/index/mapper/core/AbstractFieldMapper.java?source=c#L526-L534

--
Ivan

On Mon, Jul 14, 2014 at 12:00 AM, Jörg Prante joergprante@gmail.com wrote:

You can not change the similarity module of an index during runtime.

Jörg

On Monday, July 14, 2014 6:11:44 AM UTC+2, spancer ray wrote:

Hi Guys,

I set my similarity type to 'BM25' in elasticsearch.yml , using
index.similarity.default.type: BM25.
But in my search case(searching across some indices), I have to use the
default similarity type.
Can I set the similarity type runtime without restarting the ES cluster?
Or
using java api to make
settings take effect for specific indices or ES TransportClient?

I tried put settings in my java code while construct a TransportClient,
using code like below:
ImmutableSettings.settingsBuilder().put("index.similarity.custom.type",
"default").build();

tried ‘index.similarity.default.type’， but it seems both
'index.similarity.default.type' and 'index.similarity.custom.type'
didn't
take effect while global settings in elasticsearch.yml is set.

Can anyone help?

Thanks a lot,
Spancer

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115913.n3.nabble.com/How-to-change-similarity-settings-
runtime-tp4059810.html
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