Help with nested datatype mapping

waynesmallman · June 17, 2017, 8:25pm

Hi, I'm having problems with the schema for a nested datatype.

So far, I have the following:

"mappings": {
	"note": {
		"_all": {
			"enabled": false
		},
		"properties": {
			"user_id": {
				"type": "long"
			},
			"creation": {
				"type": "date",
				"format": "date_hour_minute_second"
			},
			"deleted": {
				"type": "integer"
			},
			"favourite": {
				"type": "integer"
			},
			"modification": {
				"type": "date",
				"format": "date_hour_minute_second"
			},
			"note": {
				"type": "text",
				"analyzer": "english",
				"fields": {
					"std": {
						"type": "text",
						"analyzer": "asset_en_analyzer",
						"fields": {
							"std": {
								"type": "text",
								"analyzer": "standard"
							}
						}
					}
				}
			},
			"title": {
				"type": "text",
				"analyzer": "english",
				"fields": {
					"std": {
						"type": "text",
						"analyzer": "asset_en_analyzer",
						"fields": {
							"std": {
								"type": "text",
								"analyzer": "standard"
							}
						}
					}
				}
			},
			"links_to_asset": {
				"type": "nested",
				"properties": {
					"note_link_id": {
						"type": "long"
					},
					"user_id": {
						"type": "long"
					},
					"creation": {
						"type": "date",
						"format": "date_hour_minute_second"
					},
					"modification": {
						"type": "date",
						"format": "date_hour_minute_second"
					},
					"to_asset": {
						"type": "long"
					},
					"from_asset": {
						"type": "long"
					},
					"comment": {
						"type": "text",
						"analyzer": "english",
						"fields": {
							"std": {
								"type": "text",
								"analyzer": "asset_en_analyzer",
								"fields": {
									"std": {
										"type": "text",
										"analyzer": "standard"
									}
								}
							}
						}
					}
				}
			}
		}
	}
}

Here, the links_to_asset appears to be of the proper format (based on the few examples I've been able to find).

However, when I populate Elasticsearch with data, the "type": "nested" attribute is removed.

Does anyone know how I could fix this?

thiago · June 19, 2017, 2:42am

I am not following what you mean by "type": "nested" attribute is removed. Is it being removed from the mapping? If not, what makes you think it is being removed? Please, give me a sample of what you are observing that makes you think it is being removed.

waynesmallman · June 19, 2017, 7:56am

Hi @thiago, that's correct.

Once data is added and I check the mappings, that attribute has been removed.

{
    "asset_en_v1": {
        "mappings": {}
    },
    "asset": {
        "mappings": {
            "note": {
                "properties": {
                    "creation": {
                        "type": "date"
                    },
                    "deleted": {
                        "type": "long"
                    },
                    "favourite": {
                        "type": "long"
                    },
                    "links_to_asset": {
                        "properties": {
                            "comment": {
                                "type": "text",
                                "fields": {
                                    "keyword": {
                                        "type": "keyword",
                                        "ignore_above": 256
                                    }
                                }
                            },
                            "creation": {
                                "type": "date"
                            },
                            "from_asset": {
                                "type": "long"
                            },
                            "modification": {
                                "type": "date"
                            },
                            "note_link_id": {
                                "type": "long"
                            },
                            "to_asset": {
                                "type": "long"
                            },
                            "user_id": {
                                "type": "long"
                            }
                        }
                    },
                    "modification": {
                        "type": "date"
                    },
                    "note": {
                        "type": "text",
                        "fields": {
                            "keyword": {
                                "type": "keyword",
                                "ignore_above": 256
                            }
                        }
                    },
                    "title": {
                        "type": "text",
                        "fields": {
                            "keyword": {
                                "type": "keyword",
                                "ignore_above": 256
                            }
                        }
                    },
                    "user_id": {
                        "type": "long"
                    }
                }
            }
        }
    }
}

thiago · June 19, 2017, 9:04am

Is this for a new index? Elasticsearch won't do that unless you are indexing in a new index. Are you using templates?

waynesmallman · June 19, 2017, 9:28am

Hi @thiago, this is a new index.

No, I'm not using templates; I'm running the mapping via Postman.

I've had similar problems with date attributes, when the data was the wrong format, so I'm wondering if this is the same, thought I don't see what's wrong with the data.

thiago · June 19, 2017, 9:32am

So you need to create the mapping in the new index before indexing. You should also index in the same type defined in the index mapping, otherwise Elasticsearch will try to autodetect the mapping and it won't autodetect nested types.

waynesmallman · June 19, 2017, 10:19am

Hi @thiago, that's what I'm doing.

Elasticsearch is performing some some autodetection in spite of the fact I'm specifying the index with exact values before indexing data.

thiago · June 19, 2017, 10:40am

What is the name of the index that you are trying to create and also could you give a sample document that you are trying to index after you create the index?

waynesmallman · June 19, 2017, 11:02am

Hi @thiago, the index is: asset_en_v1 and I'm using the alias: asset to point to it.

It's not feasible to give you a sample document as the process of indexing is automated (I'm indexing existing data from within a database).

After testing, the index and the mappings are correct throughout the application, with the exception of the nested datatype.

thiago · June 19, 2017, 11:25am

Are you sure the alias is properly setup? After you index it, verify that you can query the document in asset but also in asset_en_v1.

waynesmallman · June 19, 2017, 11:48am

Hi @thiago, here's the workflow I go through:

DEL localhost:9200/_all

PUT localhost:9200/asset_en_v1

{
	"settings": {
		"analysis": {
			"char_filter": {
				"&_to_and": {
					"type": "mapping",
					"mappings": [ "&=> and "]
				}
			},
			"filter": {
				"asset_en_stopwords": {
					"type": "stop",
					"stopwords": [ "_english_" ]
				},
				"asset_en_stemmer": {
					"type": "stemmer",
					"name": "english"
				},
				"asset_en_shingle": {
					"type": "shingle",
					"max_shingle_size": 5,
					"min_shingle_size": 2,
					"output_unigrams": false,
					"output_unigrams_if_no_shingles": true
				}
			},
			"analyzer": {
				"asset_en_analyzer": {
					"type": "custom",
					"char_filter": [ "html_strip", "&_to_and" ],
					"tokenizer": "standard",
					"filter": [ "asset_en_stopwords", "asset_en_stemmer", "lowercase", "asset_en_shingle", "asciifolding" ]
				}
			}
		}
	}
},
"mappings": {
	"note": {
		"_all": {
			"enabled": false
		},
		"properties": {
			"user_id": {
				"type": "long"
			},
			"creation": {
				"type": "date",
				"format": "date_hour_minute_second"
			},
			"deleted": {
				"type": "integer"
			},
			"favourite": {
				"type": "integer"
			},
			"modification": {
				"type": "date",
				"format": "date_hour_minute_second"
			},
			"note": {
				"type": "text",
				"analyzer": "english",
				"fields": {
					"std": {
						"type": "text",
						"analyzer": "asset_en_analyzer",
						"fields": {
							"std": {
								"type": "text",
								"analyzer": "standard"
							}
						}
					}
				}
			},
			"title": {
				"type": "text",
				"analyzer": "english",
				"fields": {
					"std": {
						"type": "text",
						"analyzer": "asset_en_analyzer",
						"fields": {
							"std": {
								"type": "text",
								"analyzer": "standard"
							}
						}
					}
				}
			},
			"links_to_asset": {
				"type": "nested",
				"properties": {
					"note_link_id": {
						"type": "long"
					},
					"user_id": {
						"type": "long"
					},
					"creation": {
						"type": "date",
						"format": "date_hour_minute_second"
					},
					"modification": {
						"type": "date",
						"format": "date_hour_minute_second"
					},
					"to_asset": {
						"type": "integer"
					},
					"from_asset": {
						"type": "integer"
					},
					"comment": {
						"type": "long",
						"analyzer": "english",
						"fields": {
							"std": {
								"type": "text",
								"analyzer": "asset_en_analyzer",
								"fields": {
									"std": {
										"type": "text",
										"analyzer": "standard"
									}
								}
							}
						}
					}
				}
			}
		}
	}

... other asset types (removed due to character length constraints).

PUT localhost:9200/asset_en_v1/_alias/asset

Then I index the data from within the application.

As I said, the mapping appears to be correct, with the exception of the nested datatype.

thiago · June 19, 2017, 12:27pm

It seems fine. Please, attach the full output of GET asset_en_v1/_mapping. Do not remove anything, if it's too big, then paste the content in pastebin.com and link it here.

waynesmallman · June 19, 2017, 2:39pm

Hi @thiago:

{
"asset_en_v1": {
"mappings": {}
}
}

I assume the alias isn't working?

thiago · June 19, 2017, 3:11pm

So if you are indexing in asset and asset_en_v1 mapping is like this it is because the alias command didn't work.

What is the output of PUT /asset_en_v1/_alias/asset command?

waynesmallman · June 19, 2017, 3:34pm

Hi @thiago:

{
    "acknowledged": true
}

If it had been anything else, I would have mentioned it.

waynesmallman · June 21, 2017, 9:25am

Hi @thiago, any further thoughts on this?

thiago · June 21, 2017, 2:27pm

There should be some command failing in between. I don't understand how you get an empty mapping with GET asset_en_v1/_mapping while your command for creating the index asset_en_v1 is defining mappings properly. Unless the create command is failing or the index is being deleted in between, I don't see how you can get an empty mapping.

waynesmallman · June 22, 2017, 9:59am

Hi @thiago, we found that the problem was in the formatting of the settings and mappings as one lump of code; Postman allowed the JSON to be executed in spite that it wasn't valid.

Thank you for your time — much appreciated!

system · July 20, 2017, 9:59am

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