# How to create index for a attachment of pdf by using elasticsearch-river-mongodb: 1.6.9 (don't have any hits,or missing fields) **URL:** \ **Category:** Elasticsearch\ **Created:** [July 8, 2013, 10:38am UTC](https://discuss.elastic.co/t/how-to-create-index-for-a-attachment-of-pdf-by-using-elasticsearch-river-mongodb-1-6-9-dont-have-any-hits-or-missing-fields/12693 "2013-07-08T10:38:09Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Jordon](https://avatars.discourse-cdn.com/v4/letter/j/d2c977/32.png) [@Jordon](https://discuss.elastic.co/u/Jordon)\ **Post date:** [July 8, 2013, 10:38am UTC](https://discuss.elastic.co/t/how-to-create-index-for-a-attachment-of-pdf-by-using-elasticsearch-river-mongodb-1-6-9-dont-have-any-hits-or-missing-fields/12693/1 "2013-07-08T10:38:09Z")
Dear All, I am new to elasticsearch. I have tried to follow the different tutorials and post on index and mapping attached pdf document in a mongodb database for days without success. After running the codes below i don't have any hits from words that exist in the mongodb attached files. software version: MongoDB: mongodb-linux-x86\_64-2.4.3 elasticsearch-river-mongodb: 1.6.9 elasticsearch: 0.90 elasticsearch-mapper-attachments: 1.7.0 Problem No. 1 * * * 1. BSON Structure, PDF attachment is in the "FileContent" field, the attachment is not in GridFS. byte [] fileser = iou.read(file); Pagecount = getpagenum(file); BasicDBObject articleobject = new BasicDBObject(); articleobject.put("Title", jsonArray.getJSONObject(i).get("Title")); articleobject.put("Authors",jsonArray.getJSONObject(i).get("Authors")); articleobject.put("Organization", jsonArray.getJSONObject(i).get("Organization")); articleobject.put("Media", jsonArray.getJSONObject(i).get("Media")); articleobject.put("ISSN", jsonArray.getJSONObject(i).get("ISSN")); articleobject.put("Pages", jsonArray.getJSONObject(i).get("Pages")); articleobject.put("Pagecount", Pagecount); articleobject.put("Abstracts", jsonArray.getJSONObject(i).get("Abstracts")); articleobject.put("Keywords", ""); articleobject.put("FileContent", fileser); collection.insert(articleobject); * * * 1. create a index curl -XPUT "[http://localhost:9200/articleindex](http://localhost:9200/articleindex)" * * * 1. create a mapping curl -XPUT '[http://localhost:9200/articleindex/cardiopathy/\_mapping](http://localhost:9200/articleindex/cardiopathy/_mapping)' -d ' { "cardiopathy" : { "properties" : { "Authors" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, "Media" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, "Organization" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, "Keywords" : { "type" : "string" ,"indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, "Title" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, "ISSN" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, "Pages" : { "type" : "string" ,"indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, "Abstracts" : { "type" : "string" ,"indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, "FileContent" : { "type" : "string" ,"indexAnalyzer": "ik","searchAnalyzer": "ik"} } } }' * * * 1. create the river curl -XPUT "[http://localhost:9200/\_river/mongodb/\_meta](http://localhost:9200/_river/mongodb/_meta)" -d ' { "type": "mongodb", "mongodb": { "host": "192.168.1.112", "port": "27107", "options": {"drop\_collection": true }, "db": "ftsearch1", "collection": "pdf" }, "index": { "name": "articleindex", "type": "cardiopathy" } }' * * * 1. Retrieve the indexed document by the keyword curl -XGET [http://localhost:9200/articleindex/cardiopathy/\_search](http://localhost:9200/articleindex/cardiopathy/_search) -d' { "fields" : ["Title"], "query" : { "text" : { "FileContent" : "高血压病辨证分型与靶器官相关性研究的新进展" }} } ' {"took":179,"timed\_out":false,"\_shards":{"total":5,"successful":5,"failed":0},"hits":{"total":0,"max\_score":null,"hits":[]}} Problem No. 2 * * * alter mapping： curl -XPUT '[http://localhost:9200/articleindex/cardiopathy/\_mapping](http://localhost:9200/articleindex/cardiopathy/_mapping)' -d ' { "cardiopathy" : { "file" : { "properties" : { "Authors" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, "Media" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, "Organization" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, "Keywords" : { "type" : "string" ,"indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, "Title" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, "ISSN" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, "Pages" : { "type" : "string" ,"indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, "Abstracts" : { "type" : "string" ,"indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, "FileContent" : { "type" : "attachment", "fields" : { "file" : { "indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes", "index" : "analyzed" }, "date" : { "store" : "yes" }, "author" : { "store" : "yes" }, "keywords" : { "store" : "yes" }, "content\_type" : { "store" : "yes" }, "title" : { "store" : "yes" } } } } } } }' Retrieve the indexed document by the keyword： {"took":63,"timed\_out":false,"\_shards":{"total":5,"successful":5,"failed":0},"hits":{"total":0,"max\_score":null,"hits":[]}} Problem No. 3 * * * 1. The attachment is in GridFS, in addition, we define the other fields. GridFSInputFile gfsFile = gfsPhoto.createFile(file); String filename = file.getName(); filename = filename.substring(0, filename.lastIndexOf(".")); gfsFile.setFilename(filename); gfsFile.put("Title", jsonArray.getJSONObject(i).get("Title")); gfsFile.put("Authors",jsonArray.getJSONObject(i).get("Authors")); gfsFile.put("Organization", jsonArray.getJSONObject(i).get("Organization")); gfsFile.put("Media", jsonArray.getJSONObject(i).get("Media")); gfsFile.put("ISSN", jsonArray.getJSONObject(i).get("ISSN")); gfsFile.put("Pages", jsonArray.getJSONObject(i).get("Pages")); gfsFile.put("Pagecount", Pagecount); gfsFile.put("Abstracts", jsonArray.getJSONObject(i).get("Abstracts")); gfsFile.put("Keywords", ""); gfsFile.save(); * * * 1. create a index curl -XPUT "[http://localhost:9200/articleindex](http://localhost:9200/articleindex)" * * * 1. create a mapping curl -XPUT '[http://localhost:9200/cardiopathyindex/cardiopathy/\_mapping](http://localhost:9200/cardiopathyindex/cardiopathy/_mapping)' -d '{ "cardiopathy": { "properties" : { "content" : { "path" : "full", "type" : "attachment", "fields" : { "content" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik"}, "Authors" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik"}, "Media" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik"}, "Organization" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik"}, "Keywords" : { "type" : "string" ,"indexAnalyzer": "ik","searchAnalyzer": "ik"}, "Title" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik"}, "ISSN" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik"}, "Pages" : { "type" : "string" ,"indexAnalyzer": "ik","searchAnalyzer": "ik"}, "Abstracts" : { "type" : "string" ,"indexAnalyzer": "ik","searchAnalyzer": "ik"}, "date" : {"format" : "dateOptionalTime","type" : "date" }, "content\_type" : { "type" : "string" } } }, "chunkSize" : { "type" : "long" }, "md5" : { "type" : "string" }, "length" : { "type" : "long" }, "filename" : { "type" : "string" }, "contentType" : { "type" : "string" }, "uploadDate" : { "format" : "dateOptionalTime", "type" : "date" }, "metadata" : { "type" : "object" } } } }' * * * 1. create the river curl -XPUT "[http://localhost:9200/\_river/mongodb/\_meta](http://localhost:9200/_river/mongodb/_meta)" -d ' { "type": "mongodb", "mongodb": { "host": "192.168.1.112", "port": "27107", "options": {"drop\_collection": true }, "db": "ftsearch", "collection": "fs", "gridfs": true }, "index": { "name": "cardiopathyindex", "type": "cardiopathy", "content\_type": "application/pdf" } }' * * * 1. Retrieve the indexed document by the keyword, hit, but the query result is missing the "Title" and "Authors" fields. curl -XGET [http://localhost:9200/cardiopathyindex/cardiopathy/\_search](http://localhost:9200/cardiopathyindex/cardiopathy/_search) -d' { "fields" : ["Title","Authors"], "query" : { "text" : { "content" : "高血压病辨证分型与靶器官相关性研究的新进展" }} } ' {"took":1005,"timed\_out":false,"\_shards":{"total":5,"successful":5,"failed":0},"hits":{"total":96,"max\_score":0.68918943,"hits":[{"\_index":"cardiopathyindex","\_type":"cardiopathy","\_id":"51d972d5948516489d1674d1","\_score":0.68918943},{"\_index":"cardiopathyindex","\_type":"cardiopathy","\_id":"51d972db948516489d167545","\_score":0.22994329},{"\_index":"cardiopathyindex","\_type":"cardiopathy","\_id":"51d972da948516489d16752c","\_score":0.20929527},....... -- 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:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [July 8, 2013, 2:19pm UTC](https://discuss.elastic.co/t/how-to-create-index-for-a-attachment-of-pdf-by-using-elasticsearch-river-mongodb-1-6-9-dont-have-any-hits-or-missing-fields/12693/2 "2013-07-08T14:19:20Z")
I think you should first create the mapping (don't _alter_ mapping as it will basically works only for new fields and not on existing ones): curl -XPUT '[http://localhost:9200/articleindex/cardiopathy/\_mapping](http://localhost:9200/articleindex/cardiopathy/_mapping)' -d ' { "cardiopathy" : { "file" : { "properties" : { "Authors" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, "Media" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, "Organization" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, "Keywords" : { "type" : "string" ,"indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, "Title" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, "ISSN" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, "Pages" : { "type" : "string" ,"indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, "Abstracts" : { "type" : "string" ,"indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, "FileContent" : { "type" : "attachment", "fields" : { "file" : { "indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes", "index" : "analyzed" }, "date" : { "store" : "yes" }, "author" : { "store" : "yes" }, "keywords" : { "store" : "yes" }, "content\_type" : { "store" : "yes" }, "title" : { "store" : "yes" } } } } } } }' HTH -- David Pilato | Technical Advocate | [Elasticsearch.com](http://Elasticsearch.com) @dadoonet | @elasticsearchfr | @scrutmydocs Le 8 juil. 2013 à 12:38, Jordon [quwu.ustb@gmail.com](mailto:quwu.ustb@gmail.com) a écrit : > Dear All, > I am new to elasticsearch. I have tried to follow the different tutorials and post on index and mapping attached pdf document in a mongodb database for days without success. After running the codes below i don't have any hits from words that exist in the mongodb attached files. > > software version: > MongoDB: mongodb-linux-x86\_64-2.4.3 > elasticsearch-river-mongodb: 1.6.9 > elasticsearch: 0.90 > elasticsearch-mapper-attachments: 1.7.0 > > Problem No. 1 > > * * * > > 1. BSON Structure, PDF attachment is in the "FileContent" field, the attachment is not in GridFS. > byte fileser = iou.read(file); > Pagecount = getpagenum(file); > BasicDBObject articleobject = new BasicDBObject(); > articleobject.put("Title", jsonArray.getJSONObject(i).get("Title")); > articleobject.put("Authors",jsonArray.getJSONObject(i).get("Authors")); > articleobject.put("Organization", jsonArray.getJSONObject(i).get("Organization")); > articleobject.put("Media", jsonArray.getJSONObject(i).get("Media")); > articleobject.put("ISSN", jsonArray.getJSONObject(i).get("ISSN")); > articleobject.put("Pages", jsonArray.getJSONObject(i).get("Pages")); > articleobject.put("Pagecount", Pagecount); > articleobject.put("Abstracts", jsonArray.getJSONObject(i).get("Abstracts")); > articleobject.put("Keywords", ""); > articleobject.put("FileContent", fileser); > collection.insert(articleobject); > > * * * > > 1. > > ``` > create a index > > ``` > > curl -XPUT "[http://localhost:9200/articleindex](http://localhost:9200/articleindex)" > > * * * > > 1. > > ``` > create a mapping > > ``` > > curl -XPUT '[http://localhost:9200/articleindex/cardiopathy/\_mapping](http://localhost:9200/articleindex/cardiopathy/_mapping)' -d ' > { > "cardiopathy" : { > "properties" : { > "Authors" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, > "Media" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, > "Organization" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, > "Keywords" : { "type" : "string" ,"indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, > "Title" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, > "ISSN" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, > "Pages" : { "type" : "string" ,"indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, > "Abstracts" : { "type" : "string" ,"indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, > "FileContent" : { "type" : "string" ,"indexAnalyzer": "ik","searchAnalyzer": "ik"} > } > } > }' > > * * * > > 1. > > ``` > create the river > > ``` > > curl -XPUT "[http://localhost:9200/\_river/mongodb/\_meta](http://localhost:9200/_river/mongodb/_meta)" -d ' > { > "type": "mongodb", > "mongodb": { > "host": "192.168.1.112", > "port": "27107", > "options": {"drop\_collection": true }, > "db": "ftsearch1", > "collection": "pdf" > }, > "index": { > "name": "articleindex", > "type": "cardiopathy" > } > }' > > * * * > > 1. Retrieve the indexed document by the keyword > curl -XGET [http://localhost:9200/articleindex/cardiopathy/\_search](http://localhost:9200/articleindex/cardiopathy/_search) -d' > { > "fields" : ["Title"], > "query" : { "text" : { "FileContent" : "高血压病辨证分型与靶器官相关性研究的新进展" }} > } > ' > > {"took":179,"timed\_out":false,"\_shards":{"total":5,"successful":5,"failed":0},"hits":{"total":0,"max\_score":null,"hits":}} > > Problem No. 2 > > * * * > > alter mapping： > > curl -XPUT '[http://localhost:9200/articleindex/cardiopathy/\_mapping](http://localhost:9200/articleindex/cardiopathy/_mapping)' -d ' > { > "cardiopathy" : { > "file" : { > "properties" : { > "Authors" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, > "Media" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, > "Organization" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, > "Keywords" : { "type" : "string" ,"indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, > "Title" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, > "ISSN" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, > "Pages" : { "type" : "string" ,"indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, > "Abstracts" : { "type" : "string" ,"indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes"}, > "FileContent" : { > "type" : "attachment", > "fields" : { > "file" : { "indexAnalyzer": "ik","searchAnalyzer": "ik","store" : "yes", "index" : "analyzed" }, > "date" : { "store" : "yes" }, > "author" : { "store" : "yes" }, > "keywords" : { "store" : "yes" }, > "content\_type" : { "store" : "yes" }, > "title" : { "store" : "yes" } > } > } > } > } > } > }' > > Retrieve the indexed document by the keyword： > > {"took":63,"timed\_out":false,"\_shards":{"total":5,"successful":5,"failed":0},"hits":{"total":0,"max\_score":null,"hits":}} > > Problem No. 3 > > * * * > > 1. > > ``` > The attachment is in GridFS, in addition, we define the other fields. > > ``` > > GridFSInputFile gfsFile = gfsPhoto.createFile(file); > String filename = file.getName(); > filename = filename.substring(0, filename.lastIndexOf(".")); > gfsFile.setFilename(filename); > gfsFile.put("Title", jsonArray.getJSONObject(i).get("Title")); > gfsFile.put("Authors",jsonArray.getJSONObject(i).get("Authors")); > gfsFile.put("Organization", jsonArray.getJSONObject(i).get("Organization")); > gfsFile.put("Media", jsonArray.getJSONObject(i).get("Media")); > gfsFile.put("ISSN", jsonArray.getJSONObject(i).get("ISSN")); > gfsFile.put("Pages", jsonArray.getJSONObject(i).get("Pages")); > gfsFile.put("Pagecount", Pagecount); > gfsFile.put("Abstracts", jsonArray.getJSONObject(i).get("Abstracts")); > gfsFile.put("Keywords", ""); > gfsFile.save(); > > * * * > > 1. > > ``` > create a index > > ``` > > curl -XPUT "[http://localhost:9200/articleindex](http://localhost:9200/articleindex)" > > * * * > > 1. > > ``` > create a mapping > > ``` > > curl -XPUT '[http://localhost:9200/cardiopathyindex/cardiopathy/\_mapping](http://localhost:9200/cardiopathyindex/cardiopathy/_mapping)' -d '{ > "cardiopathy": { > "properties" : { > "content" : { > "path" : "full", > "type" : "attachment", > "fields" : { > "content" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik"}, > "Authors" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik"}, > "Media" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik"}, > "Organization" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik"}, > "Keywords" : { "type" : "string" ,"indexAnalyzer": "ik","searchAnalyzer": "ik"}, > "Title" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik"}, > "ISSN" : {"type": "string","indexAnalyzer": "ik","searchAnalyzer": "ik"}, > "Pages" : { "type" : "string" ,"indexAnalyzer": "ik","searchAnalyzer": "ik"}, > "Abstracts" : { "type" : "string" ,"indexAnalyzer": "ik","searchAnalyzer": "ik"}, > "date" : {"format" : "dateOptionalTime","type" : "date" }, > "content\_type" : { "type" : "string" } > } > }, > "chunkSize" : { "type" : "long" }, > "md5" : { "type" : "string" }, > "length" : { "type" : "long" }, > "filename" : { "type" : "string" }, > "contentType" : { "type" : "string" }, > "uploadDate" : { > "format" : "dateOptionalTime", > "type" : "date" > }, > "metadata" : { "type" : "object" } > } > } > }' > > * * * > > 1. > > ``` > create the river > > ``` > > curl -XPUT "[http://localhost:9200/\_river/mongodb/\_meta](http://localhost:9200/_river/mongodb/_meta)" -d ' > { > "type": "mongodb", > "mongodb": { > "host": "192.168.1.112", > "port": "27107", > "options": {"drop\_collection": true }, > "db": "ftsearch", > "collection": "fs", > "gridfs": true > }, > "index": { > "name": "cardiopathyindex", > "type": "cardiopathy", > "content\_type": "application/pdf" > } > }' > > * * * > > 1. Retrieve the indexed document by the keyword, hit, but the query result is missing the "Title" and "Authors" fields. > curl -XGET [http://localhost:9200/cardiopathyindex/cardiopathy/\_search](http://localhost:9200/cardiopathyindex/cardiopathy/_search) -d' > { > "fields" : ["Title","Authors"], > "query" : { "text" : { "content" : "高血压病辨证分型与靶器官相关性研究的新进展" }} > } > ' > {"took":1005,"timed\_out":false,"\_shards":{"total":5,"successful":5,"failed":0},"hits":{"total":96,"max\_score":0.68918943,"hits":[{"\_index":"cardiopathyindex","\_type":"cardiopathy","\_id":"51d972d5948516489d1674d1","\_score":0.68918943},{"\_index":"cardiopathyindex","\_type":"cardiopathy","\_id":"51d972db948516489d167545","\_score":0.22994329},{"\_index":"cardiopathyindex","\_type":"cardiopathy","\_id":"51d972da948516489d16752c","\_score":0.20929527},....... > > -- > 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, 2:27am UTC](https://discuss.elastic.co/t/how-to-create-index-for-a-attachment-of-pdf-by-using-elasticsearch-river-mongodb-1-6-9-dont-have-any-hits-or-missing-fields/12693/3 "2017-07-06T02:27:36Z")