Adding weights param for combination technique

[martin-gaievski]

Description

Adding parameter "weights" for combination technique in normalization processor. Weights are use to multiply scores for each sub-query from the Hybrid search query. Weights are mapped to sub-query based on position (index), if there are less weights provided we use "1.0" for the rest of sub-query scores. If there are more weights provided we take first N and ignore the rest.

Parameter is set as part of the search pipeline, example of such request:

{
    "description": "Post processor for hybrid search",
    "phase_results_processors": [
        {
            "normalization-processor": {
                "normalization": {
                    "technique": "min_max"
                },
                "combination": {
                    "technique": "arithmetic_mean",
                    "parameters": {
                        "weights": [
                            0.4, 0.7
                        ]
                    }
                }
            }
        }
    ]
}

Issues Resolved

#228, part of solution for #126

Check List

• All tests pass
• New functionality has javadoc added
• Commits are signed as per the DCO using --signoff

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[codecov]

Codecov Report

Merging #235 (4d76945) into feature/normalization (2224f1f) will increase coverage by 0.40%.
The diff coverage is 95.45%.

@@                     Coverage Diff                     @@
##             feature/normalization     #235      +/-   ##
===========================================================
+ Coverage                    85.55%   85.95%   +0.40%     
- Complexity                     296      310      +14     
===========================================================
  Files                           24       24              
  Lines                          872      904      +32     
  Branches                       134      137       +3     
===========================================================
+ Hits                           746      777      +31     
  Misses                          67       67              
- Partials                        59       60       +1     

Files Changed	Coverage Δ
...rmalization/MinMaxScoreNormalizationTechnique.java	84.61% <ø> (ø)
...ation/ArithmeticMeanScoreCombinationTechnique.java	92.30% <94.11%> (+12.30%)	⬆️
...processor/combination/ScoreCombinationFactory.java	100.00% <100.00%> (ø)
...ocessor/factory/NormalizationProcessorFactory.java	100.00% <100.00%> (ø)
...essor/normalization/ScoreNormalizationFactory.java	100.00% <100.00%> (ø)