You seem highly confused about data structures.</o>

What do you mean by "working only for first element"? The first element of what? You never change $condition.

Maybe you can manually create the data structure you want and then find out how to create that structure programmatically.

I will explain more clearly now. In the input I have formula field with this type of data. I am changing it into equivalent ES query through perl and want to replace in the ES

((column08=Submit | column10=Delivered | column09=Something) & (column
+08=Delivered | column09=Something))
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Need to replace with

 
{'query' => {'constant_score' => {'filter' => {'bool' => {'should' => 
+[{'bool' => {'must' => [{'term' => {'column08' => 'Submit'}},{'term' 
+=> {'column10' => 'Delivered'}},{'term' => {'column09' => 'Something'
+}}]}},{'bool' => {'must' => [{'term' => {'column08' => 'Delivered'}},
+{'term' => {'column09' => 'Something'}}]}}]}}}}}
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This is for one cell. In the input we can get multi sheets with multi cells in a single book (Excel). We have replace all cells in that.

I am changing the input into the format what i need as in the output.

{
    "sheets": {
        "sheet1": {
            "Sheet_Name": "Ex-Sheet",
            "forumle": [
                {
                    "0": {
                        "colName": "Ex-Col1",
                        "formula": "
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((column08=Submit | column10=Delivered | column09=Something) & (column08=Delivered | column09=Something))

",
                        "total": "false"
                    },
                    "1": {
                        "colName": "Ex-Col1",
                        "formula": "
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((column08=Submit | column10=Delivered | column09=Something) & (column08=Delivered | column09=Something))

",
                        "total": "false"
                    },
                    "2": {
                        "colName": "Ex-Col1",
                        "formula": "
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(column08=Submit & column10=Delivered & column09=Something)

",
                        "total": "false"
                    }
                }
            ]
        }
    }
}
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My code

getting the input into

$doc

from the ES

Loop for getting all the conditions

foreach my $sheet (keys %{ $doc->{'_source'}{'sheets'} })
{
    foreach my $columns (@{ $doc->{'_source'}{'sheets'}{$sheet}{'forum
+le'} })
    {
        foreach my $one (keys %{ $columns })
        {
                    $condition = $columns->{$one}{'formula'};
                    $return_value = function_to_change($condition); #H
+ere I am changing my condition into required output
                    $main_hash{"query"}{"constant_score"}{"filter"} = 
+{$return_value}; #Adding some more data for that 
                    $columns->{$one}{'formula'} = \%main_hash     #Wha
+t to replace that in the original doc
                 }
        }
}
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In the last line of my code I am replacing the existing field with a hash. But its working only for the first iteration of the loop. In the second iteration its showing like

 
'bool' => {
                'should' => [
                              $VAR1->{'_source'}{'sheets'}{'sheet1'}{'
+forumle'}[0]{'1'}{'formula'}{'query'}{'constant_score'}{'filter'}{'bo
+ol'}{'should'}[0],
                             $VAR1->{'_source'}{'sheets'}{'sheet1'}{'f
+orumle'}[0]{'1'}{'formula'}{'query'}{'constant_score'}{'filter'}{'boo
+l'}{'should'}[1]]}
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instead of

 
{"query":{"constant_score":{"filter":{"bool":{"should":[{"bool":{"must
+":[{"term":{"column08":"Submit"}},{"term":{"column10":"Delivered"}},{
+"term":{"column09":"Something"}}]}},{"bool":{"must":[{"term":{"column
+08":"Delivered"}},{"term":{"column09":"Something"}}]}},{"bool":{"must
+":[{"term":{"column08":"Submit"}},{"term":{"column10":"Delivered"}},{
+"term":{"column09":"Something"}}]}},{"bool":{"must":[{"term":{"column
+08":"Delivered"}},{"term":{"column09":"Something"}}]}}]}}}}}
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But When Dump the hash or converted into json & print Its looking fine. but When I assigned it to a hash It looking like that $var->. How do assign that

That is because you are assiging the same reference to \%main_hash in multiple places.

Maybe you want to create a reference to a fresh copy of %main_hash every time? The following code will create a fresh copy of the contents of %main_hash:

{ %main_hash }
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I recommend that you trim down the amount of references you're diving around with until you understand references and data structures in general better.