Aggreagate results based on 3 different elasticsearch queries - elasticsearch

Question

I have 3 different search queries coming from different sources, I want to aggregate these queries in to a single query that will return the results that is union of these 3 queries (OR operation on query)
For example:
Query 1:
query: {
bool: {
filter: [
{ terms: { tags.keyword: ['apple', 'banana'] }},
{ terms: { language.keyword: ['en'] }},
]
}
}
Query 2:
query: {
bool: {
filter: [
{ terms: { tags.keyword: ['orange', 'mango'] }},
{ terms: { language.keyword: ['it'] }},
{ terms: { source.keyword: ['Royal Garden'] }},
]
}
}
Query 3:
query: {
bool: {
filter: [
{ terms: { owner.keyword: ['Dan Chunmun'] }},
{ terms: { language.keyword: ['en'] }},
{ terms: { source.keyword: ['Royal Garden'] }},
]
}
}
I what to have the search result that is:
Result = Query 1 OR Query 2 OR Query 3 (Union of all 3 queries)
I was looking at How to combine multiple bool queries in elasticsearch question, but there it is not explained how to merge the query.
I tried using should clause but not able to get the expected result so far.
I tried combining the bool part of the queries above like:
const boolTerms: any = [];
Queries.map(q => {
return boolTerms.push(q.query);
});
// combined query
filter : {
bool: {
should: boolTerms
}
}

Answer 1

There are two ways for combining queries
Query string query is meant for these use cases only. In query string query you can write each and every query in a string format
Let define a clause A=tags.keyword: ['apple', 'banana']
Now way you can combine multiple is this
{
"query": {
"query_string": {
"query": "(A and B) OR (D and E and F) or(G and H and E)"
}
}
}
Here A and B are all clauses of query 1.
But since query string query is a full-text query and analyzers will be applied to query terms, so for your case bool query would be used, in which you can combine tern queries as well
Here is an Example
{
"query": {
"bool": {
"should": [
{
"bool": {
"must": [
{
"terms": {
"tags.keyword": ["apple", "banana"]
}
},
{
"terms": {
"language.keyword": ["en"]
}
}
]
}
},
{
"bool": {
"must": [
{
"terms": {
"tags.keyword": ["orange", "banana"]
}
},
{
"terms": {
"language.keyword": ["it"]
}
}
]
}
}
]
}
}
}