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These are the user uploaded subtitles that are being translated: 1 00:00:07,500 --> 00:00:11,010 So how do you actually use an index in elastic search? 2 00:00:11,010 --> 00:00:13,010 Well, there's three ways we can talk about. 3 00:00:13,170 --> 00:00:15,760 One is the RESTful API. 4 00:00:15,780 --> 00:00:21,010 Now if you're not familiar with the concept of rest queries, let me explain it at a very high level. 5 00:00:21,120 --> 00:00:25,870 It's just like how you request a web page from a web server from your web browser on your desktop, 6 00:00:25,950 --> 00:00:29,630 so when you're requesting a web page on your browser like Chrome or whatever you use, 7 00:00:29,730 --> 00:00:34,740 what's happening is that your browser is sending a rest request to a web server somewhere, 8 00:00:34,740 --> 00:00:42,150 and for every rest request it has a verb like get or put or post and some sort of body that specifies 9 00:00:42,180 --> 00:00:43,870 what it is that you want to get back. 10 00:00:44,680 --> 00:00:50,170 So for example, if you're looking for a web page, you would send the rest query for a get verb and then 11 00:00:50,170 --> 00:00:56,360 that get would request a specific U.R.L. that you want to retrieve from that web server. Now elastic 12 00:00:56,360 --> 00:01:01,860 search works exactly the same way, over the same HDP protocol that web servers work across, 13 00:01:01,880 --> 00:01:05,200 so this makes it very easy to talk to a search from different systems. 14 00:01:06,520 --> 00:01:11,050 So for example, if you were searching for something on a elastic search, you would issue a get request 15 00:01:11,050 --> 00:01:16,870 through a REST API over http, and the body of that get request would contain the information about what 16 00:01:16,870 --> 00:01:20,190 it is that you want to retrieve in Json format. 17 00:01:20,290 --> 00:01:25,560 We'll see examples of this later on, but the beautiful thing about this is that if you have a language 18 00:01:25,560 --> 00:01:31,110 or an API or tool or an environment that can handle http requests, just like talking to the Web normally, 19 00:01:31,560 --> 00:01:33,800 then it can also handle elastic search. 20 00:01:33,900 --> 00:01:38,070 You don't need anything beyond that, if you understand how to structure the Json requests for elastic 21 00:01:38,070 --> 00:01:43,560 search than any language that can talk to http, can talk to an elastic search server. 22 00:01:44,070 --> 00:01:48,120 Most of this course is going to focus on doing it that way just so you understand how things work 23 00:01:48,120 --> 00:01:54,050 at a lower level, and what elastic search is capable of under the hood. But you don't always have to do 24 00:01:54,050 --> 00:01:55,360 it the hard way. 25 00:01:55,370 --> 00:02:00,230 If you're accessing elastic search from some application you're writing like a web server or web application, 26 00:02:00,230 --> 00:02:06,320 often there will be a client API that provides a level of abstraction on top of those rest queries. 27 00:02:06,470 --> 00:02:10,400 So instead of trying to figure out; how do I construct the right Jason format for the type of search 28 00:02:10,400 --> 00:02:13,290 that I want, or inserting the kind of data that I want? 29 00:02:13,390 --> 00:02:17,180 There's a lot of client API is out there that can make it easier for you. 30 00:02:17,390 --> 00:02:21,980 They just have specialized API is for searching for things and putting things into the index without 31 00:02:21,980 --> 00:02:26,040 getting into the nitty gritty of constructing the actual request itself. 32 00:02:26,060 --> 00:02:31,910 So whether you're using Python or Ruby or perl or C++ or Java there is an API out there that you can 33 00:02:31,910 --> 00:02:34,490 just use. Now in this course, 34 00:02:34,510 --> 00:02:39,170 we're going to focus on using the RESTful API and not these higher level clients. 35 00:02:39,250 --> 00:02:43,720 I don't want to single out one language as the only language that we used in this course. 36 00:02:43,720 --> 00:02:48,010 If I were to go through this whole course using only the Java client it would be useless to people coding 37 00:02:48,010 --> 00:02:53,530 in JavaScript or Python, for example, but all of the different clients in every language boil down to 38 00:02:53,530 --> 00:02:55,360 rest calls in the end. 39 00:02:55,360 --> 00:03:00,640 So if you understand the underlying http requests that these clients generate, you can understand any 40 00:03:00,640 --> 00:03:06,100 of the client APIs, and you'll be able to move more easily from one language to another too. 41 00:03:06,190 --> 00:03:10,960 So, please don't get upset that I'm not going to teach you how to write Java or any other specific language 42 00:03:10,960 --> 00:03:12,730 to use elastic search. 43 00:03:12,730 --> 00:03:17,680 The lower level information I'm giving you will make it easy to use the Java client API or the API for 44 00:03:17,680 --> 00:03:20,350 any other language. 45 00:03:20,350 --> 00:03:24,700 Finally, there are even higher level tools that can be used for analytics and one that we'll look at in 46 00:03:24,730 --> 00:03:26,380 this course is called Kibana, 47 00:03:27,130 --> 00:03:32,590 it's part of the larger elastic stack and that is a web based graphical UI that allows you to interact 48 00:03:32,590 --> 00:03:36,800 with your indices and explore them without writing any code at all. 49 00:03:36,880 --> 00:03:41,800 So it's really more of a visual analysis tool that you can unleash upon pretty much anyone in your organization. 50 00:03:43,030 --> 00:03:47,380 So in order of low level the higher level API, there are restful queries so you can issue from whatever 51 00:03:47,380 --> 00:03:52,840 language you want, you can use client API as to make things a little bit easier, or you can just use web 52 00:03:52,840 --> 00:03:57,930 based UI to get the information you need as well. So those are the basic concepts of how elastic search 53 00:03:57,930 --> 00:04:00,030 is structured and how you interface with it. 54 00:04:00,210 --> 00:04:04,050 With that under our belt, we can talk more about how it works under the hood and how its architecture 55 00:04:04,050 --> 00:04:04,560 works. 6483

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