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asahi
@@ -611,6 +611,95 @@ PUT /cooking_blog/_mapping
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>
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> 当`ignore_above`没有显式指定时，其值默认为256.
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#### 批量插入数据
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再创建索引后，可以向索引中批量插入文档数据：
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```
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POST /cooking_blog/_bulk?refresh=wait_for
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{"index":{"_id":"1"}}
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{"title":"Perfect Pancakes: A Fluffy Breakfast Delight","description":"Learn the secrets to making the fluffiest pancakes, so amazing you won't believe your tastebuds. This recipe uses buttermilk and a special folding technique to create light, airy pancakes that are perfect for lazy Sunday mornings.","author":"Maria Rodriguez","date":"2023-05-01","category":"Breakfast","tags":["pancakes","breakfast","easy recipes"],"rating":4.8}
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{"index":{"_id":"2"}}
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{"title":"Spicy Thai Green Curry: A Vegetarian Adventure","description":"Dive into the flavors of Thailand with this vibrant green curry. Packed with vegetables and aromatic herbs, this dish is both healthy and satisfying. Don't worry about the heat - you can easily adjust the spice level to your liking.","author":"Liam Chen","date":"2023-05-05","category":"Main Course","tags":["thai","vegetarian","curry","spicy"],"rating":4.6}
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{"index":{"_id":"3"}}
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{"title":"Classic Beef Stroganoff: A Creamy Comfort Food","description":"Indulge in this rich and creamy beef stroganoff. Tender strips of beef in a savory mushroom sauce, served over a bed of egg noodles. It's the ultimate comfort food for chilly evenings.","author":"Emma Watson","date":"2023-05-10","category":"Main Course","tags":["beef","pasta","comfort food"],"rating":4.7}
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{"index":{"_id":"4"}}
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{"title":"Vegan Chocolate Avocado Mousse","description":"Discover the magic of avocado in this rich, vegan chocolate mousse. Creamy, indulgent, and secretly healthy, it's the perfect guilt-free dessert for chocolate lovers.","author":"Alex Green","date":"2023-05-15","category":"Dessert","tags":["vegan","chocolate","avocado","healthy dessert"],"rating":4.5}
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{"index":{"_id":"5"}}
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{"title":"Crispy Oven-Fried Chicken","description":"Get that perfect crunch without the deep fryer! This oven-fried chicken recipe delivers crispy, juicy results every time. A healthier take on the classic comfort food.","author":"Maria Rodriguez","date":"2023-05-20","category":"Main Course","tags":["chicken","oven-fried","healthy"],"rating":4.9}
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```
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#### 执行full-text search
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full-text search会在一个或多个document fields之间执行基于文本的查询。这些查询会为每个匹配的文档计算relevance score，relevance score的计算基于文档内容和search terms的关联程度。
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ES支持多种查询类型，每种查询类型都有其`matching text`和`relevance scoring`的方法。
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##### `match`
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match是针对full-text的标准查询，基于每个字段上配置的analyzer，query text将会被分析。
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```
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GET /cooking_blog/_search
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{
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"query": {
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"match": {
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"description": {
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"query": "fluffy pancakes"
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}
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}
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}
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}
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```
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默认情况下，`match query`在resulting tokens间使用`or`，故而在上述的查询中，会查找description中包含`fluffy`或`pancakes`任一的document。
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其会返回结果如下：
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```
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{
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"took": 0,
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"timed_out": false,
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"_shards": {
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"total": 1,
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"successful": 1,
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"skipped": 0,
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"failed": 0
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},
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"hits": {
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"total": {
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"value": 1,
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"relation": "eq"
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},
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"max_score": 1.8378843,
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"hits": [
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{
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"_index": "cooking_blog",
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"_id": "1",
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"_score": 1.8378843,
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"_source": {
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"title": "Perfect Pancakes: A Fluffy Breakfast Delight",
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"description": "Learn the secrets to making the fluffiest pancakes, so amazing you won't believe your tastebuds. This recipe uses buttermilk and a special folding technique to create light, airy pancakes that are perfect for lazy Sunday mornings.",
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"author": "Maria Rodriguez",
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"date": "2023-05-01",
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"category": "Breakfast",
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"tags": [
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"pancakes",
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"breakfast",
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"easy recipes"
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],
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"rating": 4.8
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}
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}
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]
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}
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}
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```
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> ##### track total hits
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> 如果想要精确计算hit count，通常需要遍历所有的匹配文档，这将会带来很大开销。
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>
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> `track_total_hists`参数允许对`如何计算hit count`进行控制。
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> - 如果设置为true，那么会精确的计算匹配数量，`total.relation`会一直为`eq`，代表`total.value`和实际hit count相同
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> - 如果该值为其他值，例如其默认值`10000`，则该查询数量的`下限`为`10000`
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> - 如果`total.relation`为`eq`，则`total.value`代表实际hit count
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> - 如果`total.relation`为`gte`， 则`total.value`为hit count的下界，实际hit count大于或等于`total.value`
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