# "Unable to Tessellate shape....Possible malformed shape detected." Error while indexing in ES 7.17.7 **URL:** https://discuss.elastic.co/t/unable-to-tessellate-shape-possible-malformed-shape-detected-error-while-indexing-in-es-7-17-7/319922 **Category:** Elasticsearch **Created:** [November 28, 2022, 9:08am UTC](https://discuss.elastic.co/t/unable-to-tessellate-shape-possible-malformed-shape-detected-error-while-indexing-in-es-7-17-7/319922 "2022-11-28T09:08:18Z") **Posts on this page:** 20 **Page:** 1
### Author: ![amal\_antony](https://avatars.discourse-cdn.com/v4/letter/a/eada6e/32.png) [@amal\_antony](https://discuss.elastic.co/u/amal_antony) #### Post date: [November 28, 2022, 9:08am UTC](https://discuss.elastic.co/t/unable-to-tessellate-shape-possible-malformed-shape-detected-error-while-indexing-in-es-7-17-7/319922/1 "2022-11-28T09:08:18Z")
Greetings to the community! We have a logstash pipeline writing a geojson file to Elasticsearch. The file never gets fully indexed and some geo\_shape records get dropped by Elasticsearch. Identified the records that caused the issue and tried to index them individually. The cluster runs ES 7.17.7 with Lucene 8.11.1. The mapping applied was ```auto {"mappings":{"properties":{"geometry":{"type":"geo_shape"}}}} ``` A sample record is provided below. ```auto 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``` The operation fails with the following error. ```auto { "error" : { "root_cause" : [ { "type" : "mapper_parsing_exception", "reason" : "failed to parse field [geometry] of type [geo_shape]" } ], "type" : "mapper_parsing_exception", "reason" : "failed to parse field [geometry] of type [geo_shape]", "caused_by" : { "type" : "illegal_argument_exception", "reason" : "Unable to Tessellate shape [[-34.57679623838386, 116.03469600372901] [-34.57375261146071, 116.03577029370054] [-34.57506310035999, 116.03797153984577] ............[-34.57679623838386, 116.03790071758799] [-34.57679623838386, 116.05543682198346] [-34.574631647897846, 116.05340978689263] [-34.57445734494164, 116.05722722260825] ]. Possible malformed shape detected." } }, "status" : 400 } ``` The shape has been validated in [geojson.io](http://geojson.io) and renders correctly. ![Capture](https://us1.discourse-cdn.com/elastic/original/3X/f/2/f2ffa9be927b77ccbf3ed130899cef98f0e0ec77.jpeg) A previous discussion in this forum [https://discuss.elastic.co/t/err-reason-unable-to-tessellate-shape-possible-malformed-shape-detected/309989/3](https://discuss.elastic.co/t/err-reason-unable-to-tessellate-shape-possible-malformed-shape-detected/309989/3) pointed to a bug in Lucene tessellator. We tried the data on Elasticsearch versions 8.4 and 8.5, which produced the same error. Going with ES 6.3.2 (Lucene 7.3.1), the record was successfully inserted. What could be the possible cause for these records getting successfully indexed in ES 6, but failing in versions 7 and 8? ---
### Author: ![stephenb](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/stephenb/32/40856_2.png) [@stephenb](https://discuss.elastic.co/u/stephenb) #### Post date: [November 28, 2022, 3:41pm UTC](https://discuss.elastic.co/t/unable-to-tessellate-shape-possible-malformed-shape-detected-error-while-indexing-in-es-7-17-7/319922/2 "2022-11-28T15:41:49Z")
Hi @amal_antony Welcome to the Community! Perhaps take a look at this thread. There is a limit of significant digits supported. > [@Polygon storage failed](https://discuss.elastic.co/t/polygon-storage-failed/316162): > > POLYGON((38591455.29279993 3341853.182999084,38591450.89579993 3341845.826799084,38591447.82339992 3341841.763499084,38591444.25549993 3341839.186599084,38591438.30899993 3341835.420499084,38591431.17329992 3341830.663199084,38591425.92059992 3341827.491799084,38591420.66799992 3341825.311299084,38591415.11799993 3341823.130899084,38591407.68499993 3341821.346799084,38591392.42249992 3341820.553599084,38591385.18769993 3341820.652699084,38591378.64659993 3341821.148199084,38591372.99739993 33418… > `geo_shape` field uses double precision and supports up to 15 significant digits. `shape` field uses single precision and supports up to 7 significant digits `[-34.57375261146071, 116.03577029370054]` Both of those have more than 15 significant digits, ---
### Author: ![amal\_antony](https://avatars.discourse-cdn.com/v4/letter/a/eada6e/32.png) [@amal\_antony](https://discuss.elastic.co/u/amal_antony) #### Post date: [November 28, 2022, 4:05pm UTC](https://discuss.elastic.co/t/unable-to-tessellate-shape-possible-malformed-shape-detected-error-while-indexing-in-es-7-17-7/319922/3 "2022-11-28T16:05:31Z")
Thanks for the response, Stephen. Is this limit specific to a version of Elasticsearch or is it generally applicable?? We have around 20k records, out of which only a dozen that fails to index. Will check the precision of those records and get back to you. Thanks again. ---
### Author: ![Ignacio\_Vera](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ignacio_vera/32/36674_2.png) [@Ignacio\_Vera](https://discuss.elastic.co/u/Ignacio_Vera) #### Post date: [November 28, 2022, 4:13pm UTC](https://discuss.elastic.co/t/unable-to-tessellate-shape-possible-malformed-shape-detected-error-while-indexing-in-es-7-17-7/319922/4 "2022-11-28T16:13:00Z")
The thread above was a discussion about the precision between shape and geo\_shape fields and I don't think it has any connection here. I just tried to index the geometry in a recent version of Elasticsearch (ES 8.4.x) and it worked so it seems that there might be a bug in Lucene tessellator that was fixed but not backported to 7.17.x. I need to have a deeper look to check that. ---
### Author: ![Ignacio\_Vera](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ignacio_vera/32/36674_2.png) [@Ignacio\_Vera](https://discuss.elastic.co/u/Ignacio_Vera) #### Post date: [November 28, 2022, 4:30pm UTC](https://discuss.elastic.co/t/unable-to-tessellate-shape-possible-malformed-shape-detected-error-while-indexing-in-es-7-17-7/319922/5 "2022-11-28T16:30:19Z")
> [@amal\_antony](#): > > We tried the data on Elasticsearch versions 8.4 and 8.5 The polygon you posted above works on those versions so I am a bit confused with this statement. did you try with this exact polygon? ---
### Author: ![stephenb](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/stephenb/32/40856_2.png) [@stephenb](https://discuss.elastic.co/u/stephenb) #### Post date: [November 28, 2022, 5:34pm UTC](https://discuss.elastic.co/t/unable-to-tessellate-shape-possible-malformed-shape-detected-error-while-indexing-in-es-7-17-7/319922/6 "2022-11-28T17:34:28Z")
@Ignacio_Vera Curious Which polygon did you test? I did not see it posted... ---
### Author: ![amal\_antony](https://avatars.discourse-cdn.com/v4/letter/a/eada6e/32.png) [@amal\_antony](https://discuss.elastic.co/u/amal_antony) #### Post date: [November 28, 2022, 5:37pm UTC](https://discuss.elastic.co/t/unable-to-tessellate-shape-possible-malformed-shape-detected-error-while-indexing-in-es-7-17-7/319922/7 "2022-11-28T17:37:18Z")
Thanks for the response, @Ignacio_Vera . We tried the the ES versions mentioned above as the destination for the logstash pipeline. The sample provided in the original post was tested on ES 6.3 and ES 7.17. Good to know that the record was successfully indexed in ES 8.x. Let me try and collect all the records that failed during indexing and make it available as a file. Here is another sample record that's readily available. [https://controlc.com/c7439bbc](https://controlc.com/c7439bbc) I can confirm that the data given above has been tested on ES versions 6.3.2, 7.17.7 and 8.5.1. Only in 6.3.2, indexing was successful. The error screenshots are attached. **ES 8.5.1** ![image](https://us1.discourse-cdn.com/elastic/original/3X/5/1/51ff6ed54d79d434c8cf4217c104bf22478b280f.png) **ES 7.17.7** ![image](https://us1.discourse-cdn.com/elastic/original/3X/b/d/bd9ff71ae36feca0d1222e27dae828a73a1e3ee8.png) Can you confirm if this sample works in your ES instance? This could help us identify if the issue is with the input data or Elasticsearch. Appreciate your help, Ignacio. ---
### Author: ![stephenb](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/stephenb/32/40856_2.png) [@stephenb](https://discuss.elastic.co/u/stephenb) #### Post date: [November 28, 2022, 8:15pm UTC](https://discuss.elastic.co/t/unable-to-tessellate-shape-possible-malformed-shape-detected-error-while-indexing-in-es-7-17-7/319922/8 "2022-11-28T20:15:02Z")
The first Big Polygon is failing for me it starts with `[150.32665024471314,-22.961582218679766],` Perhaps isolate down to that one to help debug... ---
### Author: ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm) #### Post date: [November 29, 2022, 1:09am UTC](https://discuss.elastic.co/t/unable-to-tessellate-shape-possible-malformed-shape-detected-error-while-indexing-in-es-7-17-7/319922/9 "2022-11-29T01:09:50Z")
Also for future reference @amal_antony, if you can post the actual code you are using and not a picture we can try to replicate a _heap_ easier and help find a faster resolution for you 🙂 ---
### Author: ![amal\_antony](https://avatars.discourse-cdn.com/v4/letter/a/eada6e/32.png) [@amal\_antony](https://discuss.elastic.co/u/amal_antony) #### Post date: [November 29, 2022, 2:51am UTC](https://discuss.elastic.co/t/unable-to-tessellate-shape-possible-malformed-shape-detected-error-while-indexing-in-es-7-17-7/319922/10 "2022-11-29T02:51:02Z")
Thanks for the suggestion, @warkolm. For debugging, we are now using the good old indexing API of ES. The error messages and the sample data exceeded the character limit. That's why I had to resort to external links and screenshots. ---
### Author: ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm) #### Post date: [November 29, 2022, 5:21am UTC](https://discuss.elastic.co/t/unable-to-tessellate-shape-possible-malformed-shape-detected-error-while-indexing-in-es-7-17-7/319922/11 "2022-11-29T05:21:26Z")
Ahh fair enough, gist/pastebin/etc is good for that longer stuff! ---
### Author: ![Ignacio\_Vera](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ignacio_vera/32/36674_2.png) [@Ignacio\_Vera](https://discuss.elastic.co/u/Ignacio_Vera) #### Post date: [November 29, 2022, 9:38am UTC](https://discuss.elastic.co/t/unable-to-tessellate-shape-possible-malformed-shape-detected-error-while-indexing-in-es-7-17-7/319922/12 "2022-11-29T09:38:50Z")
I checked the second geometry and I can reproduce the issue in Lucene tessellator. If it is ok with you, I will open an issue and add the provided geometry for testing. ---
### Author: ![amal\_antony](https://avatars.discourse-cdn.com/v4/letter/a/eada6e/32.png) [@amal\_antony](https://discuss.elastic.co/u/amal_antony) #### Post date: [November 29, 2022, 11:16am UTC](https://discuss.elastic.co/t/unable-to-tessellate-shape-possible-malformed-shape-detected-error-while-indexing-in-es-7-17-7/319922/13 "2022-11-29T11:16:48Z")
Thanks for the update, Ignacio. I have been able to collect all the polygons that were failing to index. [https://raw.githubusercontent.com/amalantonygit/polygon-data/main/polygon.json](https://raw.githubusercontent.com/amalantonygit/polygon-data/main/polygon.json) There are 16 records, which shows issues in ES versions 7.17 and 8.5. The data was successfully indexed in an ES 6.3.2 instance. It would be great, if you can test out this data as well. @Ignacio_Vera Please do the needful to escalate the issue and produce a viable solution. Thanks in advance. ---
### Author: ![Ignacio\_Vera](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ignacio_vera/32/36674_2.png) [@Ignacio\_Vera](https://discuss.elastic.co/u/Ignacio_Vera) #### Post date: [November 29, 2022, 12:13pm UTC](https://discuss.elastic.co/t/unable-to-tessellate-shape-possible-malformed-shape-detected-error-while-indexing-in-es-7-17-7/319922/14 "2022-11-29T12:13:43Z")
Thank you, that is helpful. ---
### Author: ![Ignacio\_Vera](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ignacio_vera/32/36674_2.png) [@Ignacio\_Vera](https://discuss.elastic.co/u/Ignacio_Vera) #### Post date: [November 29, 2022, 2:35pm UTC](https://discuss.elastic.co/t/unable-to-tessellate-shape-possible-malformed-shape-detected-error-while-indexing-in-es-7-17-7/319922/15 "2022-11-29T14:35:32Z")
I open [Fix algorithm that chooses the bridge between a polygon and a hole by iverase · Pull Request #11988 · apache/lucene · GitHub](https://github.com/apache/lucene/pull/11988) ---
### Author: ![amal\_antony](https://avatars.discourse-cdn.com/v4/letter/a/eada6e/32.png) [@amal\_antony](https://discuss.elastic.co/u/amal_antony) #### Post date: [November 30, 2022, 6:22am UTC](https://discuss.elastic.co/t/unable-to-tessellate-shape-possible-malformed-shape-detected-error-while-indexing-in-es-7-17-7/319922/16 "2022-11-30T06:22:01Z")
Hi @Ignacio_Vera. Just needed a quick clarification regarding the bug you have identified. You mentioned that you were able to reproduce the issue in Lucene tessellator when working on this polygon. > **[{"type":"Feature","properties":{},"geometry":{&quo - c7439bbc](https://controlc.com/c7439bbc)** > > {"type":"Feature","properties":{},"geometry":{"type":"MultiPolygon","coordinates":\[\[\[\[150. - c7439bbc How about the set of 16 polygons shared as a file? Is it safe to say that these records are also affected by the same bug or should we investigate other possible issues? Thanks in advance. ---
### Author: ![Ignacio\_Vera](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ignacio_vera/32/36674_2.png) [@Ignacio\_Vera](https://discuss.elastic.co/u/Ignacio_Vera) #### Post date: [November 30, 2022, 8:11am UTC](https://discuss.elastic.co/t/unable-to-tessellate-shape-possible-malformed-shape-detected-error-while-indexing-in-es-7-17-7/319922/17 "2022-11-30T08:11:27Z")
The issue above fixes all the polygons except the first one which clearly suffers from a different error. If you run the tessellator on it you get the following error: ```auto java.lang.IllegalArgumentException: at least three non-collinear points required ``` Having a closer look into the multi-polygon, the issue is the following polygon: ```auto { "type": "Polygon", "coordinates": [[ [ 145.22954, -42.0], [145.2295402, -42.0], [145.2295404, -42.0], [145.22954, -42.0] ] ] } ``` It is such a tiny polygon that the current mathematics using naive double floating point arithmetic detects all points as collinear. There is already an issue related open in Lucene's repository: > > > \### Description > > The following polygons are valid, but considered self intersect…ing by Lucene : > > \`\`\` > POLYGON ((8.8970989818779 54.4134906575883, 8.90042774485873 54.4146874897743, 8.90594809529893 54.4171621281855, 8.91004327482905 54.4202335124536, 8.90936000005425 54.4216600000818, 8.9234299997357 54.4292900002006, 8.8925999997461 54.4125699999037, 8.88701999937444 54.4128200006828, 8.88024999984759 54.4117399999775, 8.87049000011837 54.407389999926, 8.85725999978773 54.4065399997888, 8.8324600004316 54.4108700007071, 8.83028999859022 54.4107799999813, 8.83010999956348 54.4097399998029, 8.83542087096422 54.4081201758963, 8.8434158599249 54.4059310703591, 8.8498879933749 54.4038371457592, 8.85426620240666 54.4029805394939, 8.85731191163137 54.4032660762063, 8.86483100908713 54.4043130389967, 8.87230838608615 54.4060266046257, 8.88148723601366 54.4091671397265, 8.88577026584612 54.4101189229804, 8.89195686439317 54.4116417778086, 8.8970989818779 54.4134906575883)) > > POLYGON ((7.89437024403906 47.5862590252318, 7.89312177803361 47.5869704801294, 7.89281574806746 47.5870946189537, 7.89525097569983 47.5857177586665, 7.89806367361792 47.5841274339808, 7.90068804512661 47.5825559862467, 7.89998956367071 47.5830121477752, 7.89515885167079 47.585809621127, 7.89437024403906 47.5862590252318)) > > POLYGON ((11.0774300000168 54.2984399992536, 11.0827805841396 54.2829539912519, 11.0830386027471 54.2818703102967, 11.0832788032709 54.2797565892852, 11.0832799998269 54.2798199998029, 11.0830099985918 54.2822900002149, 11.0774300000168 54.2984399992536)) > \`\`\` > > @craigtaverner made some research and noted the following : > > \_all have a feature in common, a very narrow constriction, causing one side of the polygon to touch (almost) the other side. This is likely the source of the issue, and in-line with your theory regarding numerical errors.\_ > > \_I've just written tests for these polygons in the latest version of lucene, and all three fail triangulation (a necessary step for indexing the polygons). So this is, I believe, the lucene tessellator (triangulator) code not being able to handle these points being so close to the other edge of the polygon.\_ > > \_I think it is the indexing that is failing, since triangulation is only needed for indexing, So until you import it to the index, it is fine. I was reading the code in this area, and found an interesting comment about it not including some special floating point tricks to be more accurate. So it could be that we just have to implement those tricks. I saw a link to this page which might cover those needs. https://www.cs.cmu.edu/~quake/robust.html\_ > > > \### Version and environment details > > \_No response\_ This might not be so fast to be implemented. ---
### Author: ![amal\_antony](https://avatars.discourse-cdn.com/v4/letter/a/eada6e/32.png) [@amal\_antony](https://discuss.elastic.co/u/amal_antony) #### Post date: [November 30, 2022, 8:53am UTC](https://discuss.elastic.co/t/unable-to-tessellate-shape-possible-malformed-shape-detected-error-while-indexing-in-es-7-17-7/319922/18 "2022-11-30T08:53:39Z")
Thanks for the input, @Ignacio_Vera. Would it be reasonable to go with an old unsupported version of ES just because it allows these polygons to be ingested? If we are to wait for these bugfixes to be available as part of the next Lucene/ES release, how long would that usually take? Does Elastic Cloud suite of products have a quicker release cycle or patch policy? Posing this as an open question to the community. ---
### Author: ![Ignacio\_Vera](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ignacio_vera/32/36674_2.png) [@Ignacio\_Vera](https://discuss.elastic.co/u/Ignacio_Vera) #### Post date: [November 30, 2022, 1:14pm UTC](https://discuss.elastic.co/t/unable-to-tessellate-shape-possible-malformed-shape-detected-error-while-indexing-in-es-7-17-7/319922/19 "2022-11-30T13:14:24Z")
Just try the following in a 6.3.2 cluster: ```auto PUT test { "mappings": { "_doc": { "properties": { "location": { "type": "geo_shape" } } } } } POST test/_doc { "location" : { "type": "MultiPolygon", "coordinates": [[ [ [ 145.1194357, -42.0328663], [145.2394921, -42.0328663], [145.238194, -42.0324013], [145.2413307, -42.030857], [145.2421013, -42.0328663], [145.2453252, -42.0328663], [145.2451415, -42.0296059], [145.2423991, -42.0288757], [145.242294, -42.0270011], [145.2396978, -42.0263096], [145.2383414, -42.0245118], [145.23677, -42.0236206], [145.2365672, -42.0200124], [145.234043, -42.0193404], [145.2327576, -42.0180775], [145.245172, -42.0176479], [145.246755, -42.0170759], [145.2428411, -42.0148595], [145.2426304, -42.011107], [145.2455743, -42.011008], [145.2466708, -42.0075152], [145.2429881, -42.0065354], [145.242883, -42.004661], [145.2402109, -42.0039505], [145.2401058, -42.0020762], [145.2380872, -42.0013631], [145.2368416, -42.0042547], [145.234441, -42.0043383], [145.2337822, -42.0079475], [145.2367682, -42.0084112], [145.2376288, -42.0106883], [145.2399768, -42.0120204], [145.236817, -42.0134902], [145.2355708, -42.0163784], [145.234605, -42.0146504], [145.2330055, -42.011015], [145.2280009, -42.01052], [145.2277023, -42.0052257], [145.2260031, -42.0032782], [145.2245612, -42.0], [145.1194357, -42.0], [145.1194357, -42.0328663] ], [[ 145.2367682, -42.0084112], [145.2370348, -42.0062198], [145.2404944, -42.0067536], [145.2398255, -42.009308], [145.2367682, -42.0084112] ] ], [[ [ 145.22954, -42.0], [145.2295402, -42.0], [145.2295404, -42.0], [145.22954, -42.0] ] ] ] } } ``` That's the first polygon on the list, it fails with he following error: ```auto { "error": { "root_cause": [ { "type": "mapper_parsing_exception", "reason": "failed to parse [location]" } ], "type": "mapper_parsing_exception", "reason": "failed to parse [location]", "caused_by": { "type": "invalid_shape_exception", "reason": "Self-intersection at or near point (145.22954, -42.0, NaN)" } }, "status": 400 } ``` Can you confirm it works for you? ---
### Author: ![amal\_antony](https://avatars.discourse-cdn.com/v4/letter/a/eada6e/32.png) [@amal\_antony](https://discuss.elastic.co/u/amal_antony) #### Post date: [November 30, 2022, 2:12pm UTC](https://discuss.elastic.co/t/unable-to-tessellate-shape-possible-malformed-shape-detected-error-while-indexing-in-es-7-17-7/319922/20 "2022-11-30T14:12:53Z")
Hi @Ignacio_Vera. Getting the same error in 6.3.2, when trying to index it individually. I must have overlooked this one. So, first polygon definitely has the self-intersection issue. ```auto { "error": { "root_cause": [ { "type": "mapper_parsing_exception", "reason": "failed to parse [location]" } ], "type": "mapper_parsing_exception", "reason": "failed to parse [location]", "caused_by": { "type": "invalid_shape_exception", "reason": "Self-intersection at or near point (145.22954, -42.0, NaN)" } }, "status": 400 } ``` [Next page](https://discuss.elastic.co/t/unable-to-tessellate-shape-possible-malformed-shape-detected-error-while-indexing-in-es-7-17-7/319922.md?page=2)