# Has\_parent query noted as experimental **URL:** \ **Category:** Elasticsearch\ **Created:** [June 25, 2013, 7:22pm UTC](https://discuss.elastic.co/t/has-parent-query-noted-as-experimental/12543 "2013-06-25T19:22:50Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![George\_Stathis](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/george_stathis/32/918_2.png) [@George\_Stathis](https://discuss.elastic.co/u/George_Stathis)\ **Post date:** [June 25, 2013, 7:22pm UTC](https://discuss.elastic.co/t/has-parent-query-noted-as-experimental/12543/1 "2013-06-25T19:22:50Z")
Hi folks, I see in the docs that the has\_parent[http://www.elasticsearch.org/guide/reference/query-dsl/has-parent-query/](http://www.elasticsearch.org/guide/reference/query-dsl/has-parent-query/)query is noted as experimental since 0.19.10 . Other than the memory considerations, are there any other gotchas that we should be aware of? Thank you in advance. -- 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:** ![mvg](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/mvg/32/98890_2.png) [@mvg](https://discuss.elastic.co/u/mvg)\ **Post date:** [June 26, 2013, 9:50am UTC](https://discuss.elastic.co/t/has-parent-query-noted-as-experimental/12543/2 "2013-06-26T09:50:12Z")
I think the experimental flag can be removed from the documentation page. It has been out in the wild for quite some time now. We keep on improving the has\_parent and the parent/child support in general. For example recently in 0.90.1 we reduced the memory footprint of parent/child significantly. Besides the memory considerations, I would also recommend the use the warmer api in combinations with parent/child. The allows the loading of the id\_cache to happen in a controlled manner as part of the refresh. If you don't use warmers then all the initial first searches try the load the values for the id\_cache, but only one search request wins, so a lot of unnecessary work is done as part of the first searches. If you're planning on using parent/child on a index with a lot of documents (like 100M docs), you might need to increase the number of primary shards and have sufficient nodes for those shards in order to make searches the parent/child queries execute within an acceptable time range. On 25 June 2013 21:22, George Stathis [gstathis@gmail.com](mailto:gstathis@gmail.com) wrote: > Hi folks, I see in the docs that the has\_parent[http://www.elasticsearch.org/guide/reference/query-dsl/has-parent-query/](http://www.elasticsearch.org/guide/reference/query-dsl/has-parent-query/)query is noted as experimental since 0.19.10 . Other than the memory > considerations, are there any other gotchas that we should be aware of? > > Thank you in advance. > > -- > 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). -- Met vriendelijke groet, Martijn van Groningen -- 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:** ![George\_Stathis](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/george_stathis/32/918_2.png) [@George\_Stathis](https://discuss.elastic.co/u/George_Stathis)\ **Post date:** [June 27, 2013, 6:43pm UTC](https://discuss.elastic.co/t/has-parent-query-noted-as-experimental/12543/3 "2013-06-27T18:43:28Z")
Thanks Martijn. Good to know it's mature. That was my impression as well. As for warmers, we are already using them because we are heavy users of top\_children, so the parent ids are already loaded up in RAM. I don't know if has\_parent will use the same cache but I think we have enough spare memory to accomodate it as well. We haven't upgraded to 0.90.x yet but I think that's in the works in the next month or so. On Wednesday, June 26, 2013 5:50:12 AM UTC-4, Martijn v Groningen wrote: > I think the experimental flag can be removed from the documentation page. > It has been out in the wild for quite some time now. We keep on improving > the has\_parent and the parent/child support in general. For example > recently in 0.90.1 we reduced the memory footprint of parent/child > significantly. > > Besides the memory considerations, I would also recommend the use the > warmer api in combinations with parent/child. The allows the loading of the > id\_cache to happen in a controlled manner as part of the refresh. If you > don't use warmers then all the initial first searches try the load the > values for the id\_cache, but only one search request wins, so a lot > of unnecessary work is done as part of the first searches. > > If you're planning on using parent/child on a index with a lot of > documents (like 100M docs), you might need to increase the number of > primary shards and have sufficient nodes for those shards in order to make > searches the parent/child queries execute within an acceptable time range. > > On 25 June 2013 21:22, George Stathis \<[gsta...@gmail.com](mailto:gsta...@gmail.com) \\>wrote: > > > Hi folks, I see in the docs that the has\_parent[http://www.elasticsearch.org/guide/reference/query-dsl/has-parent-query/](http://www.elasticsearch.org/guide/reference/query-dsl/has-parent-query/)query is noted as experimental since 0.19.10 . Other than the memory > > considerations, are there any other gotchas that we should be aware of? > > > > Thank you in advance. > > > > -- > > 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). > > -- > Met vriendelijke groet, > > Martijn van Groningen -- 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/has-parent-query-noted-as-experimental/12543/4 "2017-07-06T02:29:11Z")