# Using scroll and choosing on types **URL:** \ **Category:** Elasticsearch\ **Created:** [June 14, 2013, 7:19am UTC](https://discuss.elastic.co/t/using-scroll-and-choosing-on-types/12413 "2013-06-14T07:19:34Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![sujoysett](https://avatars.discourse-cdn.com/v4/letter/s/2acd7d/32.png) [@sujoysett](https://discuss.elastic.co/u/sujoysett)\ **Post date:** [June 14, 2013, 7:19am UTC](https://discuss.elastic.co/t/using-scroll-and-choosing-on-types/12413/1 "2013-06-14T07:19:34Z")
Hi, One confusion about using search types in scroll .... curl -XGET '://\_search?search\_type=scan&scroll=10m&size=50&pretty=1' -d '{ "query" : { "match\_all" : {} } }' gives me only the scroll ID and an empty array in hits. This is expected. Next I use this scroll ID to get hits, chaining the returned scroll ID in every subsequent request. curl -XGET '://\_search?search\_type=dfs\_query\_then\_fetch&scroll=10m&size=50&pretty=1' -d '{ "query" : { "match\_all" : {} } }' gives me the scroll ID and some hits. Why the hits are also getting returned in this step when using dfs\_query\_then\_fetch instead of scan? Tried using POST and not GET, but same results. Any help? Thanks, - Sujoy. -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![sujoysett](https://avatars.discourse-cdn.com/v4/letter/s/2acd7d/32.png) [@sujoysett](https://discuss.elastic.co/u/sujoysett)\ **Post date:** [June 18, 2013, 4:48am UTC](https://discuss.elastic.co/t/using-scroll-and-choosing-on-types/12413/2 "2013-06-18T04:48:51Z")
Hi, Sorry for repeated request, but I am still confused on this issue. Am I doing something wrong in my query, or missing any additional parameter? Thanks in advance, - Sujoy. On Friday, June 14, 2013 12:49:34 PM UTC+5:30, Sujoy Sett wrote: > Hi, > > One confusion about using search types in scroll .... > > curl -XGET > '://\_search?search\_type=scan&scroll=10m&size=50&pretty=1' > -d '{ > "query" : { > "match\_all" : {} > } > }' > > gives me only the scroll ID and an empty array in hits. This is expected. > Next I use this scroll ID to get hits, chaining the returned scroll ID in > every subsequent request. > > curl -XGET > '://\_search?search\_type=dfs\_query\_then\_fetch&scroll=10m&size=50&pretty=1' > -d '{ > "query" : { > "match\_all" : {} > } > }' > > gives me the scroll ID and some hits. Why the hits are also getting > returned in this step when using dfs\_query\_then\_fetch instead of scan? > > Tried using POST and not GET, but same results. > > Any help? > > Thanks, > > - Sujoy. -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![spinscale](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/spinscale/32/25011_2.png) [@spinscale](https://discuss.elastic.co/u/spinscale)\ **Post date:** [June 24, 2013, 1:26pm UTC](https://discuss.elastic.co/t/using-scroll-and-choosing-on-types/12413/3 "2013-06-24T13:26:52Z")
Hey, you cannot combine dfs search type with scroll request parameters. The scroll parameter only works if the search type is scan. What are you trying to achieve by mixing these? --Alex On Tue, Jun 18, 2013 at 6:48 AM, Sujoy Sett [sujoysett@gmail.com](mailto:sujoysett@gmail.com) wrote: > Hi, > > Sorry for repeated request, but I am still confused on this issue. > Am I doing something wrong in my query, or missing any additional > parameter? > > Thanks in advance, > > - Sujoy. > > On Friday, June 14, 2013 12:49:34 PM UTC+5:30, Sujoy Sett wrote: > > > Hi, > > > > One confusion about using search types in scroll .... > > > > curl -XGET '://\_\*\*search?search\_type=scan&\*\*scroll=10m&size=50&pretty=1' > > -d '{ > > "query" : { > > "match\_all" : {} > > } > > }' > > > > gives me only the scroll ID and an empty array in hits. This is expected. > > Next I use this scroll ID to get hits, chaining the returned scroll ID in > > every subsequent request. > > > > curl -XGET '://_\*\*search?search\_type=dfs\_query_\*\* > > then\_fetch&scroll=10m&size=50&\*\*pretty=1' -d '{ > > "query" : { > > "match\_all" : {} > > } > > }' > > > > gives me the scroll ID and some hits. Why the hits are also getting > > returned in this step when using dfs\_query\_then\_fetch instead of scan? > > > > Tried using POST and not GET, but same results. > > > > Any help? > > > > Thanks, > > > > - Sujoy. > > -- > You received this message because you are subscribed to the Google Groups > "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![sujoysett](https://avatars.discourse-cdn.com/v4/letter/s/2acd7d/32.png) [@sujoysett](https://discuss.elastic.co/u/sujoysett)\ **Post date:** [June 24, 2013, 2:05pm UTC](https://discuss.elastic.co/t/using-scroll-and-choosing-on-types/12413/4 "2013-06-24T14:05:51Z")
Hi Alex, The applications I work on needs processing and remodeling of data indexed in ES, which necessarily involves re-indexing of documents. When such processing runs on an entire index, we use scroll along with scan search type and match\_all query. But when we need a processing re-run on selective documents, we use scroll with dfs\_query\_then\_fetch search type and requirement specific term or range query. I don't know why you are saying these can not be mixed. It does work, and it is working in my code from ES version 0.19.\* onward. I actually revisited my code before posting this reply just to confirm my words. -- Sujoy. On Monday, June 24, 2013 6:56:52 PM UTC+5:30, Alexander Reelsen wrote: > Hey, > > you cannot combine dfs search type with scroll request parameters. The > scroll parameter only works if the search type is scan. > What are you trying to achieve by mixing these? > > --Alex > > On Tue, Jun 18, 2013 at 6:48 AM, Sujoy Sett \<[sujo...@gmail.com](mailto:sujo...@gmail.com)\ > > > wrote: > > > Hi, > > > > Sorry for repeated request, but I am still confused on this issue. > > Am I doing something wrong in my query, or missing any additional > > parameter? > > > > Thanks in advance, > > > > - Sujoy. > > > > On Friday, June 14, 2013 12:49:34 PM UTC+5:30, Sujoy Sett wrote: > > > > > Hi, > > > > > > One confusion about using search types in scroll .... > > > > > > curl -XGET '://\_\*\*search?search\_type=scan&\*\*scroll=10m&size=50&pretty=1' > > > -d '{ > > > "query" : { > > > "match\_all" : {} > > > } > > > }' > > > > > > gives me only the scroll ID and an empty array in hits. This is > > > expected. Next I use this scroll ID to get hits, chaining the returned > > > scroll ID in every subsequent request. > > > > > > curl -XGET '://_\*\*search?search\_type=dfs\_query_\*\* > > > then\_fetch&scroll=10m&size=50&\*\*pretty=1' -d '{ > > > "query" : { > > > "match\_all" : {} > > > } > > > }' > > > > > > gives me the scroll ID and some hits. Why the hits are also getting > > > returned in this step when using dfs\_query\_then\_fetch instead of scan? > > > > > > Tried using POST and not GET, but same results. > > > > > > Any help? > > > > > > Thanks, > > > > > > - Sujoy. > > > > -- > > You received this message because you are subscribed to the Google Groups > > "elasticsearch" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to [elasticsearc...@googlegroups.com](mailto:elasticsearc...@googlegroups.com) \. > > For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 6, 2017, 2:29am UTC](https://discuss.elastic.co/t/using-scroll-and-choosing-on-types/12413/5 "2017-07-06T02:29:47Z")