Learning Elasticsearch

Searching all the fields in the document

Elasticsearch lets you search for a value across all the fields in the document. If you are exploring the data or you don't care about which field contains the search input, you can use the _all field. To make this possible, when you index a document, all the field values in the document are combined into one big string, separated by a space and indexed as the _all field. For example, we are indexing e-commerce order documents, and order documents contain buyer, seller, and item_title fields. An example order document is shown next:

PUT chapter3/order/1 {   "buyer": "john",   "seller": "jake",   "item_title": "iphone",   "order_date": "2017-02-08" }

When the preceding document is indexed along with the document ...