Kyra Mackintosh

In Elasticsearch, an index (plural: indices) contains a schema and can have one or more shards and replicas. An Elasticsearch index is divided into shards and each shard is an instance of a Lucene index.

Indices are used to store the documents in dedicated data structures corresponding to the data type of fields. For example, text fields are stored inside an inverted index whereas numeric and geo fields are stored inside BKD trees.

The following example is based on Elasticsearch version 5.x onwards. An index with two shards, each having one replica will be created with the name test_index1

All the index names and their basic information can be retrieved using the following command:

Let’s add a document in the index with the command below:

It is possible to search multiple indices with a single request. If it is a raw HTTP request, index names should be sent in comma-separated format, as shown in the example below, and in the case of a query via a programming language client such as python or Java, index names are to be sent in a list format.

We need to know that there are non-expendable assets in our legal system to understand the concept of NFTs. The goods that can be exchanged have a value based on their number or weight. Non-expendable goods are replaceable.

Money is an example of fungible assets.

If you have a 20-euro bill, you can easily swap it for another 20-euro bill and it is the same. When you use it, you consume it.

An example of a non-expendable good would be a work of art. If you have a box at home, you can't replace it.

One work of art is not the same as another, so it can't be exchanged like a bill.

Non-Fungible token is a non-fungible token. Cryptocurrencies have units of value that are assigned to them. And it is that NFTs have a close relationship with cryptocurrencies, at least technologically, although they are opposites, since a Bitcoin is a fungible good, and an NFT is a non-fungible good, but in essence, they are like the two sides of a technological currency.

We can think of cryptocurrencies as a store of value, like gold, if you understand it.

When the number of buyers increases, the price of gold goes up, and when the number of buyers decreases, the price goes down. It is the same behavior as cryptocurrencies.

You can swap one gold for another without a problem. There are other goods made of gold that have the same value, but are different, and that makes a difference.

NFTs are unique assets that can't be changed or swapped for another that has the same value, just like a piece of art or gold.

You can think of an NFT as a great piece of art like Da Vinci'sMona Lisa. There is only one and it is in an art gallery.

You can only buy the original if it is for sale. Since it would not be the original, you could also get a copy. That is what the NFT does.

To understand it better, an NFT would be like a unique work of art, for example, Michelangelo's David, there is only one and it is in the Accademia Gallery in Florence; If someone wanted to have that particular David, they should buy it (if it was for sale) or get a copy, in which case, we would no longer be talking about the original, which is what gives the sculpture its value.

NFTs are often attached to digital works.

The drawing of a rock attached to an NFT costs 260,000 euros, and now that it's at a peak of popularity, there are people who pay that price.

NFTs work with technology. It is the same technology as cryptocurrencies, which work through a computer network with blocks or nodes linked. Each block is resistant to data modification and links to a previous block.

NFTs have a digital certificate of authenticity that cannot be changed.

All transactions and acquisitions that have been made are recorded as well as the author of the book in the Metadata.

The SELECT TOP clause allows you to limit the number of rows or percentage of rows returned in a query result set Because the order of rows stored in a table